The Hellenistic and Parthian periods

The nobles and the nomads

As he was finishing the conquest of eastern Iran—and at a moment when his attention was being drawn toward the conquest of India—Alexander was confronted by two human factors that were of the greatest importance for the future of his empire. The first of these was the powerful local aristocracy of this part of the Achaemenian Empire, which held enormous properties and dominated the indigenous population. The second was the nomad population that for centuries had wandered along the northern and northeastern frontiers of Iran.

Alexander seems to have admired greatly the barons of eastern Iran; he had taken note of their ardour during the two years of hard and constant fighting in his conquest of northeastern Iran. Realizing how such a force could benefit the future of his empire, Alexander convoked an assembly of Bactrian nobles. He ordered 30,000 young men to be chosen for training in the Macedonian military disciplines. He understood the importance and effectiveness of the Iranian light cavalry armed with the bow, and his army would make use of this training in its march toward the plains of India. Alexander married Roxana of Sogdiana, daughter of a chief of one of the conquered countries, thereby symbolizing the union of the two peoples.

But Alexander was not unaware that other measures were needed to ensure his control of these vast territories. He founded many new cities, or refounded some that were already in existence. Many of these were placed strategically along the northern frontiers as protection. Almost half of these new cities were located in the high (eastern) satrapies. This policy of Alexander’s would soon be abandoned by the Seleucids, whose efforts at city planning were mostly confined to their western possessions. In contrast with Alexander, the Seleucids were unable to maintain the good rapport with the eastern Iranian nobility that Alexander had believed essential. And this deficiency, a result of the Seleucids’ “pro-Macedonian” policies, was one of the principal causes for the progressive decline of the Seleucid empire.

The second of the human factors, the nomads, inhabited the immense territories beyond the northern frontiers. They fought constantly with the settled populations but could nevertheless occasionally ally with them in the face of necessity. When Alexander arrived on the banks of the Jaxartes (Syr Darya) River, it marked the limit of the “civilized” world; beyond stretched the Eurasian wilderness. The Roman historian Quintus Curtius recounts Alexander’s meeting with a delegation of Scythians who gave him a warning. They told him,

Just cross the Tanais [properly the Jaxartes] and you will see how far Scythia stretches. You will never conquer the Scythians. Our poverty makes us quicker than your army, which bears plunder from so many nations. Just when you think we are far away, then will you see us in your camp. We know how to pursue and how to flee with the same swiftness. [One recalls here the famous “Parthian shot,” a metaphor drawn from a neighbouring people.] We seek out those deserts totally devoid of human culture rather than the cities and the rich countryside.

These words sum up what the nomad world represented to an empire that stretched several thousand miles from east to west. The settled population knew the threat only too well. Alexander was not the first to cross swords with the nomads. Cyrus II, founder of the Achaemenian Empire, had paid with his life while fighting them, and Darius I, believing he could take them from behind through southern Russia, suffered a crushing defeat in his campaign against the Scythians along the shores of the Black Sea.

If the nomads and the eastern Iranian nobility were the two dominant factors in the decline of the Seleucid kingdom and if the events they provoked were some of the principal causes for the exhaustion and eventual fall of that state, these same causes later played a significant role in the collapse of Parthian power. Parthia was undermined by an aristocracy that retained its military power and refused to bend before the royal will or to give up its meddling in the country’s politics. In the meantime the kingdom’s unruly nomadic neighbours to the north and the northeast, at the cost of the lives of several Parthian sovereigns, weakened the kingdom and sometimes added a complementary element to the often numerous intrigues of the pretenders to supreme power during the course of the almost half a millennium of the existence of the Parthian kingdom.

The Seleucids

In the struggle for power after Alexander’s death, Seleucus I brought under his control the whole eastern part of Alexander’s empire. But even before he had consolidated his control over this territory, the eastern provinces on the Indian frontier had begun to revolt. By about 304 bc Seleucus was forced to abandon these to Chandragupta, the founder of the great Maurya empire in India. This was a serious loss to the Seleucids, for they lost not only the Indian territory conquered by Alexander but also frontier districts west of the Indus River. As recompense, Seleucus received 500 elephants, which he took back with him to Syria. From this time on, the west was dominant in the Seleucids’ politics, to the detriment of their eastern possessions. This near disinterest of the Seleucids in the far-off eastern regions must have alienated the Greeks who had settled there, far from their homeland, and the thought of taking back their full independence could not have been far from their minds.

Soon afterward (c. 290–280 bc) the two eastern provinces of Margiana and Aria suffered an invasion by nomads. But the invasion was repelled, and the nomads were pushed back beyond the Jaxartes. Demodamas, a general to the first two Seleucid kings, crossed the river and even put up altars to Apollo, ancestor of the dynasty. Alexandria in Margiana and Heraclea in Aria, founded by Alexander, were rebuilt by Antiochus I under the names Antioch and Achaea, respectively, and a wall nearly 100 miles (160 km) long was put up to protect the oasis of Merv against future invasions, the menace of which was never far away. Patrocles received a commission to explore the Caspian Sea.

Seleucus I and his successors hoped to Hellenize Asia and held the conviction that the Greeks and Macedonians were a superior people and the bearers of a superior civilization. A network of cities and military colonies was built to assure the stability of a state whose inhabitants would be Asians. The Greek language made deep inroads, especially among the families of those numerous Greeks who married the local women and among those engaged in commerce. But after the 2nd century bc and the slowing of the Greco-Macedonian immigration, the Greek language lost ground and the local element became dominant.

The people of Iran, particularly those in the upper stratum of society, borrowed nothing from Hellenism but its exterior forms. Even the Iranians who lived in such cities as Seleucia or Susa do not seem to have been deeply affected by Greek ideas.

The movement of Iranian peoples

The victories of Alexander had brought the Greeks to the limits of the known world. But less than a century after Alexander’s death there began a great movement back, propelled by stirring peoples in the Iranian world. In a movement westward from the 3rd century bc, the Sarmatians occupied the northern shore of the Black Sea. While driving back their close relatives, the Scythians, they succeeded in “Sarmatizing” the Greek cities along its shores. At the end of the 3rd century, there began in Chinese Turkistan a long migration of the Yuezhi, an Iranian people who invaded Bactria about 130 bc, putting an end to the Greco-Bactrian kingdom there. (In the 1st century bc they created the Kushān dynasty, whose rule extended from Afghanistan to the Ganges River and from Russian Turkistan to the estuary of the Indus.) Finally, the Parni, a nomadic or seminomadic people from Iran, appeared in the mid 3rd century bc. Taking a median direction between the Sarmatians and Yuezhiuezhi, the Parni gained control of the Seleucid satrapy of Parthia and created the Parthian (Ashkanian) kingdom. The Parthian state restored Achaemenian power for nearly half a millennium, and its arrival coincided with the expansion of Rome and played a significant role in the destinies of the world during the last three centuries bc and the first two centuries ad.

Revolt of the high satrapies

The empire of the Seleucids, like that of the Achaemenids before them, was shaken by revolts of the satraps. The difficult situation in the west and the grave reverses suffered by the royal house accelerated the weakening of the Macedonian kingdom. The loss of its eastern possessions in the 3rd century bc, however, proved fatal to the Seleucid cause. Diodotus I, a Greek who found himself at the head of the satrapy of Bactria, led a revolt that brought independence about 250 bc; at about the same time, Arsaces led the Scythian Parni into Parthia and defeated Andragoras, establishing an independent native dynasty.

Parthia was the first province to detach itself from the Seleucid empire, just as it had been the first to rise up on the occasion of the accession of Darius the Great. Andragoras, though he did not declare himself king, showed his independence by minting his own coins. At this time Parthia was one of the poorer of the high satrapies, caught between the mountains and the great central desert and without large agricultural resources. This satrapal independence might seem surprising if it were not for the fact that the main route for the silk trade crossed right through Parthia over a distance of more than 100 miles (160 km). The tolls the caravans paid must have produced a sizable income.

The defection of Diodotus I is still easier to understand. Bactria, a vast country of a “thousand cities,” was located at the junction of the routes to China and India, and it was rich in cultivable land. The Greco-Bactrian kingdom founded by Diodotus expanded rapidly, embracing Sogdiana and Aria and extending southward and southeastward.

Being at some distance from the west, Diodotus and his successors gradually adopted the customs and lifestyles of their subjects. The closer these ties were drawn, the stronger became the loyalty of the Bactrians. It is believed that the separation of Diodotus from the Seleucids might, over the long term, have seemed to the Bactrians and Sogdians as the realization of their political destiny, and they might have looked on these satraps as men acting in their interest. For more than a century (230–130 bc) this kingdom held the frontiers and barred the route to the nomads.

Invasion of the Parni

Arsaces, who was chief of the Parni (a member tribe of the Dahae confederation) must have begun his struggle against the Seleucids from 247 bc, the year from which the Parthians dated their history. This does not necessarily mean that Arsaces was crowned king in 247. Other Iranian dynasties (e.g., the Sāsānids; see below The Sāsānian period) dated the beginning of their eras from the time when they began to establish their power rather than from the time of coronation of the first monarch of their line.

Daho-Parno-Parthian tribes “chose chiefs for war and princes for peace” from among the closest circle of the royal family. They were famous for their breeding of horses, their combat cavalry, and their fine archers. Alexander encountered them during his Bactrian campaign, and the Greek writers who recorded his reign remarked on their agility and effectiveness as horsemen. They were a people who kept the traditions of patriarchal tribal organization. The Parni, with Arsaces at their head, took the province of Parthia after having beaten Andragoras; soon neighbouring Hyrcania was annexed, and the Parni reached the Caspian Sea. Arsaces had himself crowned in the city of Asaak, and the tribe took the name of the Parthians, their close relatives, which was derived from a word meaning “exiled.” Their language was closely related to Scythian and Median. The dynasty these people produced never broke its links with the people, and rare was the Arsacid dynastic sovereign who did not turn to his people in time of danger.

Formation of the Parthian state

Although the two new kingdoms, that of Arsaces I’s Parthians and the Greco-Bactrian kingdom of Diodotus I, sprang up almost simultaneously and very near each other, there were notable differences between them. The motivating force behind the rebellion in Bactria was an association—or perhaps even a collaboration—between the local nobility (large landholders who dominated the whole indigenous population) and the local Greek community. Both groups were opposed to the Macedonian domination represented by the Seleucid dynasty.

The makeup of the Parthian kingdom seems to have been different. It was essentially built on the relationship of the inhabitants of Parthia to the neighbouring tribes outside the static frontiers—an ethnic mass, half nomadic and half settled, that inhabited the north of Iran. The success of Arsaces and his men was based on their strength, their spirit, and the weakness of their enemies. The Greek element present in Parthia does not seem to have played a role similar to that played by its counterpart in Bactria. In fact, the Parthians, at least initially, may have been hostile to the local Greek populations. During their war with Antiochus III (see below), they massacred all the Greek inhabitants of the city of Syrinx in Hyrcania.

Arsaces

Arsaces seems to have enjoyed great fame among the tribes. His name remained linked with the names of the sovereigns of this dynasty, who succeeded each other for the four and a half centuries of the Parthian state. His image regularly appeared on the obverse of Parthian coins until the end of the period.

The rupture of the communications link between the Seleucid capitals and the east caused by Arsaces’ success placed Diodotus in a difficult situation. He seems to have wanted to collaborate with Seleucus II Callinicus in a campaign he was preparing against the Parthians. The death of Diodotus (c. 234 bc) and the accession of his son, Diodotus II, reversed matters, for the young successor changed his father’s policy and joined with Arsaces. It was not until 232 or 231 bc that Seleucus arrived in the east to put down the rebellion. Arsaces, who had remained closely allied with the nomads to the north, sensed his own weakness in the face of Seleucus’s army and fled to the home of the Apasiacae, or “Scythians of the Waters.” Seleucus tried to cross the Jaxartes but, having suffered losses at the hands of the nomads, decided to return to Syria after receiving alarming news from the west. He made peace with Arsaces, who recognized his suzerainty.

From that time on, Arsaces changed his policy: he acted no longer as a nomad but rather as a chief of state—a worthy successor to the Seleucids, whose example he followed, in Parthia. He had himself crowned. Besides Asaak and Dārā (an impregnable fortress), he founded such cities as Nisā, where he would be buried. These new cities were usually named for the king or the dynasty. Arsaces seems not to have infringed on the rights of the Greeks and Macedonians living in these cities, perhaps hoping to win their support. From the beginning, while maintaining the autonomy of the cities, he made use of propaganda to ensure their continuing obedience. He installed his capital at Hecatompylos, on the Silk Road. His death is dated between 217 and 211 bc.

Artabanus I

Arsaces’ successor, Artabanus I (reigned c. 211–191 bc), sometimes known as Arsaces II, continued the work of consolidation. Artabanus, already solidly established in Parthia and Hyrcania, tried to extend his possessions toward Media. But events in the neighbouring Greco-Bactrian kingdom worked against him: Diodotus II (accused, it is thought, of treason to Hellenism through his alliance with the nomads) lost his throne, which passed to Euthydemus by the time the Syrian army of the Seleucid king Antiochus III (the Great) arrived in Hyrcania.

The wave of revolts by the eastern satraps, which began a movement away from unity in the state, also affected western Iran; the beginning of the reign of Antiochus (223–187 bc) was marked by the dissidence of Molon and his brother Alexander, satraps of Media and Persis, respectively. Antiochus did not undertake his campaign for recovery of the high satrapies—a project his father had planned and never carried out—until 212 bc. At that time his kingdom stretched no farther east than Media, Persis, Susiana, and Carmania. His operations against Artabanus were successful; he took Hecatompylos and crossed the mountains separating it from Parthia, which he occupied. Artabanus fled and took refuge with the friendly Apasiacae, as had his father, Arsaces. However, the conflict between the Seleucids and Parthia was ended by a compromise, just as it had been at the time of the invasion of Seleucus II. Because a much more important struggle, against the Bactrian kingdom of Euthydemus, awaited Antiochus, he preferred to make peace with Artabanus, to whom he accorded the title of king in exchange for recognition of his fealty, and he obliged the Parthian to send troops to reinforce the Syrian army. The rear of the Seleucid king was safeguarded, but the two provinces held by Artabanus were definitively lost by the Macedonians.

The period following Antiochus’s campaign against the Parthians was marked by a strong resistance by the Bactrian cavalry at the frontier and by a Seleucid siege of Bactra, for two years the Bactrian capital (208–207 bc). There, too, the Seleucid king made peace: Euthydemus, like Artabanus, kept his title of king. Demetrius, son of Euthydemus, married a daughter of Antiochus the Great, thus preserving his political prestige.

Having acquired war elephants and provisions for his army in Bactria, Antiochus crossed the Hindu Kush into the Kabul valley, where he concluded a pact with the Indian king Sophagasenos, secured still more elephants, and returned by way of southern Iran. The results of this long campaign were meagre. Antiochus recognized the independence of two kingdoms, that of the Parthians and that of Euthydemus, which previously had been no more than satrapies. The struggle must have weakened these two states, but, after their status was legalized, they proceeded to reestablish their material and military resources.

Phraates I

Precise information is not available concerning the reign of Priapatius (c. 191–176 bc), who succeeded Artabanus and whose name appears in documents found in excavations at Nisā. Under his son Phraates I (reigned c. 176–171 bc), the young Parthian kingdom seems to have recuperated sufficiently to have taken up once again its expansionist activities. It attacked Media, succeeded in the conquest of the Mardi tribe near the Caspian Sea, and set up a defense of the “Caspian Gates,” an important strategic point of penetration in Phraates’ possessions. Overturning tribal tradition, which reserved the succession to the throne to the eldest son, he wisely designated as a successor—even though he had several sons—his brother Mithradates.

Mithradates I

Parthian military, political, and economic power expanded considerably following the accession of Mithradates I. The king began with an attack on the Greco-Bactrian kingdom, which at the time was going through a period of weakness; then he turned against the west and declared himself independent of the Seleucids. To show his complete independence—he was the first of the Parthian sovereigns to do so—he began issuing coins bearing his likeness wearing a royal diadem like the Seleucid kings. On the reverse side was a representation of Arsaces, ancestor of the Parthian dynasty, seated on an omphalos (hemispheric altar) and holding a bow, in imitation of Seleucid coins that showed Apollo in the same way, as the ancestor of the Seleucids.

The Seleucid king Antiochus IV Epiphanes took action against Mithradates but was killed at Tabae (or Gabae, probably present Eṣfahān). His death brought about a widespread dislocation of the Macedonian kingdom, which crumbled into several smaller states. Toward 160 bc the power to unite most of the high satrapies and other eastern satrapies could come only from the Parthians, who under Mithradates began the assault. They occupied Media in 155, which opened the route to Mesopotamia. In 148–147 Mithradates reached Ecbatana, where he moved his capital. Rhagae was “refounded” and given the dynastic name of Arsacia, and in 141 Mithradates took Seleucia on the Tigris and was recognized king of Babylonia. His forces conquered Susiana and Elymais, either at this time or after 139. In 141 he was obliged to leave Hyrcania for his eastern possessions, which were evidently being menaced by hostile movements of the nomads. There he spent the remaining three years of his reign.

The Seleucid king Demetrius II, probably aware of Mithradates’ difficulties in the east, undertook an effort to recover Mesopotamia, but after a few successes he suffered defeat and was taken prisoner (139 bc). He was sent to Hyrcania and was married there to a daughter of Mithradates, who by this union became related to the house of Seleucus. The army of Demetrius included Greco-Bactrian and Elymaian troops—which is understandable—as well as men from Persis, or Persians, who by their cooperation with the Macedonians seem to indicate their opposition to the expansionism of the Parthians, whom they considered foreigners and conquerors. Iran under the Parthians was an empire but not yet a nation.

Phraates II

Like his father, Mithradates I, Phraates II (reigned c. 138–128 bc) was to remain for some time in the eastern provinces. He also endured a last Macedonian attempt to break the Parthian advance. Antiochus VII Sidetes—brother of Demetrius II, who had been taken prisoner—assembled a powerful army, which once more included men of Persis and Elymais. The strength in numbers and the wealth of this army made an impression on contemporaries, who reported that even the simple soldiers wore shoes cobbled with gold. Phraates was beaten in several battles, but time worked on his side. With the arrival of winter, Antiochus quartered his troops in several localities in Media. The local population, exasperated by the undisciplined Syrian soldiery, rose up in revolt. Antiochus was killed and his son taken prisoner (129 bc). Thanks to the loyalty of the Medians, whose sentiments contrasted with those of the Persians, Phraates was victorious. The year 129 bc was a turning point in the history of the eastern Mediterranean: Greco-Macedonian domination received a decisive blow; it would survive for only 46 more years.

The route to great acquisitions in the west seemed to open before Phraates, if the nomads did not stop him. Weakened in his struggle against Antiochus VII, he called on the Śaka nomads to the north of his frontiers for aid, promising them payment. The reinforcements arrived too late to be of use; he sent them back, which provoked them to revolt and pillage the countryside. The Greek prisoners drafted by Phraates into his army participated in the pillaging, and Phraates lost his life fighting them. The same fate was reserved for his successor and uncle, Artabanus II (c. 128–124/123 bc). The Śaka were pushed back with some difficulty toward Drangiana, to which they gave their name, Sakastan (Sīstān). Another branch of the vast nomadic movement crossed the Oxus and put an end to the Greco-Bactrian kingdom, on the ruins of which the powerful Kushān kingdom was to be built.

The second stage of the phil-Hellenistic period extends from the first quarter of the 2nd century until about 30 bc and embraces a period when Parthia reached the apogee of its power and worldwide territorial expansion.

Mithradates II

The reign of Mithradates II, from 123 to 88 bc, constitutes the most glorious chapter of Parthian history. It put an end to the ambitions of Artabanus’s son Himerus, left by his father as governor of Mesopotamia, and brought Hyspaosines, king of Mesene (Characene), who had extended his possessions too far toward the north, back into submission. In the east the Śaka were on the move—soon an independent state would be formed there that would push toward eastern Iran and India; in the 1st century bc two dynasties, the Indo-Scythian and the Indo-Parthian, whose members would remain closely linked to the Arsacid dynasty, were to reign in that region. They would disappear after being absorbed by the Kushān kingdom.

The eastern frontiers of Mithradates II incorporated Margiana and Aria. Once order was restored in the east, the king turned toward the west: he placed Tigranes II (the Great) on the throne of Armenia, and, extending his hegemony over this kingdom and over eastern Asia Minor, he organized pressure on the last Seleucids. A meeting with Rome, which had already formed a “Province of Asia” in Asia Minor, became inevitable and took place in 92 bc on the Euphrates River between the Roman general Lucius Cornelius Sulla and the Parthian ambassador Orobaze. Mithradates II wisely refused to agree to follow in the Roman path and preferred to retain his neutrality in the struggle between Rome and Mithradates VI Eupator of Pontus. Rome in the west and Parthia in the east met as Alexander’s successors and, with a common accord, settled the inheritance. The two parties recognized the Euphrates as a common frontier. It seems there was no longer a question of either an alliance or a signed convention. Upon his return, Orobaze paid with his head for the lèse-majesté he had committed by accepting a seat lower than Sulla’s at their meeting.

For the first time, Parthian power entered into direct contact with the Chinese empire and received an embassy from the Han emperor Wudi (140–87 bc), who dispatched an escort of 20,000 men to meet the Parthians. The Chinese were particularly interested in the horses raised in Fergana, which they needed to create a cavalry to fight the nomadic Xiongnu on their northern border.

At the zenith of his power, Mithradates II took the title of “king of kings”; in the east as well as in the west, his empire achieved a position of power and stability previously unknown. He maintained diplomatic relations with the two greatest world powers, Rome and China. Mithradates I, Phraates II, and Mithradates II were the true creators of the Parthian state, winning for it military and economic victories and raising it to a level comparable to that of the Achaemenian Empire. After the death of Mithradates II, a short period of intrigue and rivalry saw the succession, in turn, of Gotarzes I, Orodes I, and Sanatruces. The latter came to power late in life and was replaced in 70 bc by his son, Phraates III (70–58/57 bc), under whom sustained contacts with Rome took place.

Wars with Rome

In 69 bc the Roman general Lucius Licinius Lucullus, in charge of looking after Roman interests in the East, attempted to lure Phraates III into an alliance that would help Rome in its struggle against Pontus and Armenia, but the Parthian king, while still maintaining “friendly” relations with Rome, retained his neutrality. An agreement with the Romans renewed the Euphrates line as a frontier. Three years later the Roman general Pompey the Great replaced Lucullus and succeeded in concluding a real alliance with Phraates III. This proved, however, to be of short duration, for affairs in Armenia, aggravated by Roman operations on Parthian territory, had brought the two empires to a parting of the ways. Pompey replied to Phraates’ protestations by occupying Gordyene, a vassal state of the Parthians, and addressed Phraates with the simple title “king.” Pompey did not trouble himself over entering into direct relations with the sovereigns of Media and Elymais, vassals of Phraates. The position taken by the Romans toward the king of kings was rather more like that of conquerors than of allies. Pompey’s policy became clear: from the Caucasus to the Persian Gulf, he hoped to create a wall of states friendly to Rome that would encircle Parthia, in preparation for Roman conquest.

That action fell within the jurisdiction of the Roman triumvir Marcus Licinius Crassus. As early as 57 bc a conflict with Rome broke out over the case of Mithradates III (58/57–55 bc), who, opposing Orodes II (c. 57–37/36 bc), his brother (both having killed their father, Phraates III), fled to Syria and asked the legate Aulus Gabinius for aid and asylum. The Roman Senate forbade Gabinius to involve himself in the dispute over the succession to the Parthian throne. Three years later the tension between the two powers was settled in bloody fashion, and the rupture was consummated in 53 bc. Without provocation, the army of Crassus—the only one of the triumvirs without military glory (Julius Caesar was conqueror of Gaul, and Pompey was conqueror of the Middle East)—crossed the Euphrates. Orodes protested and invoked the treaty of friendship in vain. Crassus refused to reply until he arrived at Seleucia on the Tigris. It was a brutal breaking of all the agreements concluded in 69 and 66 bc.

The Battle of Carrhae (53 bc), with the Parthians led by Surenas with his light and heavy cavalry, cost Rome seven legions and the lives of Crassus and his son. Through Surenas’s brilliant victory the routes to Iran and India were closed to Rome, and its ambitions in the Orient were so weakened that the Euphrates became not only a political but also a spiritual frontier; no effort at Romanization beyond it was possible any longer. A united Greco-Iranian front protected Asia against the Romanization of Iranianized Hellenism and destroyed the myth of Roman invincibility.

The insignia of the Roman legions fell into Parthian hands, and 10,000 Roman prisoners were sent into captivity in Margiana. The victory over Crassus had great repercussions among the peoples of the East. It shook the Roman position in Asia Minor, Syria, and Palestine, while it restored the Parthians’ confidence in their power and in their ability to resist Rome and promised them a dominant position among the peoples of the East. According to the Greek writer Plutarch, the severed head of Crassus was brought to Orodes like a hunting trophy while he was attending a presentation of Euripides’ play The Bacchae.

The Parthian counterthrust in 52–50 bc under the command of Prince Pacorus (Pakores) was not crowned with success. The Arsacid army did not know how to organize long campaigns or how to lay siege to fortified cities. But soon, civil war in Rome reinforced the position of the Parthians, and Pompey, after being defeated by Caesar, thought of taking refuge among them. It is thought that Orodes, taking advantage of this lull, succeeded in resolving difficulties in the east with the Yuezhiuezhi, even perhaps with the Kushān. In 48 bc, with Pompey dead, Caesar was the absolute master of the Roman world. He was preparing to avenge Crassus’s defeat when he was assassinated in 44 bc. The duty of following through on Caesar’s project fell to Mark Antony. Pacorus, anticipating Antony, crossed into Syria after having concluded an agreement with Quintus Labienus, a Roman commander on the side of Caesar’s assassins who had gone over to the Parthians. The successes of the two armies were startling: Labienus took all of Asia Minor, Pacorus all of Syria and Palestine. For nearly two years all the western provinces of the Achaemenids remained in Parthian hands. In Rome it was rumoured that the Parthians were planning to invade Italy itself. But the successes of the Arsacid armies were as ephemeral as they were remarkable. Disagreement between the two generals weakened their effect. In 39 bc Labienus was conquered by Roman forces under Publius Ventidius and slain. Asia Minor was recovered by the Romans, and the following year the same fate struck Pacorus and his conquests.

Under Orodes II the Parthians had reached the zenith of their power: in the west the Arsacids had for a short time reestablished the empire of the Achaemenids almost in its entirety. Their successes in the east seem to have been equally important. Their capital was moved to Ctesiphon, where a military camp was transformed into a great metropolis, facing Seleucia across the Tigris. At Nisā the city was expanded, the royal palaces were enlarged, and the royal hypogea (catacombs) were enriched with precious pieces of fine Greco-Iranian art.

In 37 bc Orodes was assassinated by his son Phraates IV, who also did away with his brothers and his eldest son. In 36 bc Mark Antony began to carry out the revenge Caesar had planned. He brought his army to Armenia, through which he planned to enter Media and attack Parthia from the north. But cold weather and Phraates’ cavalry combined to force Antony to abandon the fight and return to Syria. In 34 bc he launched another campaign and again suffered heavy losses, and his power struggle with Octavian forced him to abandon his plans for war against the Parthians.

About 30 bc Tiridates II, a pretender to the throne of Parthia supported by Rome, forced Phraates IV to leave Mesopotamia and take refuge with his eastern neighbours, the Scythians, who restored him to power. Driven out, Tiridates took refuge at Rome. He returned again in 26 bc, after which Phraates was able to definitively reestablish his power at the same time that Octavian was inaugurating the imperial period of Roman history.

Settlement with Rome

The new stage in the phil-Hellenistic period began about 31 bc, when, after his victory over Mark Antony, Octavian (now Caesar Augustus) was the sole master in Rome. Before that, however, he had already proposed to Phraates an alliance and a treaty ending the war. The Battle of Carrhae and Antony’s defeat had raised Parthia to a major power in the eyes of Rome. Augustus put pressure on Phraates IV through the pretender Tiridates and even tried military intervention. In the end a pact was signed in 20 bc that allowed Roman prisoners and the insignia of the conquered legions to be returned. A new stage began in relations between the two states, marked by the conclusion of a real peace that recognized the Euphrates as a frontier between them. Phraates was dealt with as the sovereign of a great nation. Rome renounced its ambitions in the east, and Augustus inaugurated a policy of respect. The two states could do nothing but profit from the agreement, for a defeat would have been fatal to either power and a victory hazardous. The caravan route to India and China was reopened. Augustus received ambassadors from the many eastern peoples, including the Indo-Scythians and the Sarmatians. The only country in the east where Rome remained active was Armenia.

All obstacles, however, were not necessarily eliminated. There remained the question of Armenia: if it was controlled by Rome, it would be a channel for penetration into Parthia from the north, but if it was controlled by Parthia, it would offer an outlet on the Black Sea, over which Rome asserted its authority. The rivalry of the two powers over this country would remain for centuries a stumbling block to peace.

Toward 10 or 9 bc Phraates sent his four sons and grandsons to Rome, a gesture that was both one of confidence in a “friendly” power and also a guarantee that his throne would pass to his son by Musa, an Italian slave girl given him by Augustus. This son would assassinate his father with his mother’s help and occupy the throne as Phraates V from 2 bc to ad 4 after having married his mother.

The end of the “phil-Hellenistic” period is marked by the clash of the ruling class with foreign influences that had penetrated life in Parthian society. These influences came from Rome and were often introduced by princes of the Arsacid house returning from stays abroad. The short reign of Orodes III (ad 4–6/7) was followed by that of Vonones I (7/8–11), a son of Phraates IV who, because of his Roman habits, was driven out by the Parthian nobility, whose role by that time had become dominant in internal politics and dynastic questions. Vonones’ fall brought about a change in the destinies of the country.

Artabanus III

The king chosen by the barons to replace Vonones was Artabanus III (reigned 12–38). They were certainly mistaken in believing they would find in him an easy instrument to manipulate. Artabanus was the son of a viceroy of Hyrcania and was Arsacid only on his mother’s side. Under his rule Parthia entered a brilliant but troubled era, one completely dominated by the personality of this violently anti-Roman sovereign who was eager to drive Rome out of Asia. However, after he failed to place his son on the throne of Armenia, for years Artabanus avoided precipitating matters with Rome and dedicated himself to internal reforms, among which centralization was the most important.

The humbling of the great nobles, an enterprise in which he was sustained by the lesser nobles, became necessary. He had to reduce the hereditary privileges the barons had carved out for themselves. It was also necessary to reorganize the states that made up the kingdom. He put princes of his family on the thrones of Mesene, Persis, Elymais, Atropatene—all little states that were governed by men loyal to the throne. But it proved impossible for him to put down a revolt in the eastern possessions, where the Indo-Parthian king Gondophares declared himself independent (c. 19) and took the title “king of kings.”

It is thought that the position taken toward the city-states, about which precise information is lacking, was the reason for the seven-year-long revolt of Seleucia on the Tigris. The fighting there took place between the Greek and Hellenized elements and the Semites, who demanded their right to participate in the autonomy of the city and who supported pretenders against Artabanus III.

A new attempt to place a son on the throne in Armenia angered Rome, which, with the aid of the nobility, sent for Tiridates III, a pretender the barons had crowned at Ctesiphon. Artabanus was forced to take refuge with the Dahae, who helped him win back his throne. In 37 a meeting with a representative of Rome on a bridge in the middle of the Euphrates allowed an agreement to be reached that maintained the status quo in Armenia and recognized Parthian sovereignty with the river as the frontier. Artabanus, a strong personality, did not seek to impose his kingdom as a world power, but he did not hesitate to make plans to regain the western provinces, the former Achaemenian possessions.

Dissolution of the Parthian state

The period from 51 to 122 is one in which the Parthian state slowly dissolved and decomposed into several small countries, and various parties lay claim to the throne—an inevitable result of the weakness of the central power. In the 1st century ad the Parthian empire, according to the Roman historian Pliny, was composed of 18 kingdoms, 11 in the north and seven in the south, some governed by Arsacid princes and others by local dynasties. In 58 Hyrcania became independent. In the realm of external affairs, an effort was made to maintain good relations with Rome, especially because of the new kingdom of the Kushān, which was causing concern on the eastern frontiers. It might be for this reason that in 87 Parthia sent an embassy to neighbouring China to the east of the Kushān. Internally, the ethnic upsurge became more accentuated.

After the short reign of Vonones II (51), the throne passed to Vologeses I (reigned 51–80), an ardent anti-Roman. One of his brothers, Vonones, was made king of Media. Vologeses I wanted his second brother, Tiridates, to be king of Armenia—putting him in position to break with Rome, which opposed him militarily. Upon orders from Nero, the Roman general Corbulo secured Armenia, but his operations were broken off by the exchange of ambassadors. An agreement was finally reached: in 66 Tiridates left for Rome with his whole family, surrounded by a retinue of princes and 3,000 Parthian nobles. He received from Nero the crown of Armenia. Parthian control and the end of hostilities were announced by closing the doors to the Temple of Janus.

Nationalist sentiment—which had been expressed under Artabanus III in a genealogical table invented to prove the Achaemenian descent of the Arsacid house—also manifested itself under Vologeses I: the Avesta, the holy book of the Iranians, was compiled, and coins were issued on which, for the first time, Pahlavi (Middle Persian) characters were added to the Greek legend.

In 78 Pacorus II came to the throne, to be supplanted in 79 by the ephemeral Artabanus IV (80/81), who was then replaced permanently by Pacorus II. During his reign the country showed signs of a profound decomposition. The barons refused to obey the crown. In the provinces the army and the finances were in the hands of the nobility. Aristocrats occupied the highest positions, which became hereditary. Plots with Rome were hatched, and the nobility felt itself the equal of the dynasty, ready to revolt in defense of their privileges. Externally, the dynasty was unable to count on Rome, which constantly plotted in support of new pretenders. In 109/110 Pacorus II was eclipsed by Osroes, his brother or brother-in-law, but he maintained limited power until his death in 115/116.

In 114 the emperor Trajan invaded Armenia. In vain did the king put his crown at Trajan’s feet—he was defeated by the Roman soldiery. With Armenia occupied, the emperor descended with his army into Mesopotamia. All of Babylonia was taken, and Ctesiphon, the capital, fell into the hands of the Romans, who carried off a daughter of Osroes and the golden throne of the Parthian kings. Victorious, Trajan went as far east as the Persian Gulf. Iranian reaction was not long in coming. Faced with the gravity of the Roman offensive, all the princes of the royal house, formerly divided by internal strife, united against the invader. At Ctesiphon Trajan crowned a new vassal king, but revolt was in the wind, and attempts to disunite the Parthian chiefs failed. The Romans suffered losses, and, after a reverse on the walls of Hatra, Trajan abandoned the campaign and died on his way home. Trajan’s successor, Hadrian (reigned 117–138), abandoned all pretensions to Armenia, Mesopotamia, and Assyria.

Hadrian’s desire for peace seems to have been sincere. He sent back Osroes’ daughter, promised to return the golden throne, and did not try to profit from the long power struggle between Osroes and Vologeses III (or II). He even invited Osroes to come to Rome.

Peace with Rome

Thus ensued four decades of peace with Rome. The status quo it maintained with its western neighbour seems even to have been a necessity for Parthia, the expansion of the Kushān kingdom on the eastern frontiers having reached the peak of its power under King Kaniṣka (Kanishka). Accurate information about the relations between the Kushān and the Parthians is not available, but this long peace sought with Rome suggests that certain precautions were necessary for the kingdom of Iran.