Gnaeus Julius Agricola, the Roman governor of Britain from 77 to 84 ce, was the first Roman general to operate extensively in Scotland. He defeated the native population at Mons Graupius, possibly in Banffshire, probably in 84 ce. In the following year he was recalled, and his policy of containing the hostile tribes within the Highland zone, which he had marked by building a legionary fortress at Inchtuthil in Strathmore, was not continued. His tactics were logical if Scotland was to be subdued but probably required the commitment of more troops than the overall strategy of the Roman Empire could afford. The only other period in which a forward policy was attempted was between about 144 and about 190, when a turf wall, the Antonine Wall (named for the emperor Antoninus Pius), was manned between the Forth and the Clyde.

The still-impressive stone structure known as Hadrian’s Wall had been built between the Tyne and Solway Firth between 122 and 128, and it was to be the permanent northern frontier of Roman Britain. After a northern uprising, the emperor Severus supervised the restoring of the Hadrianic line from 209 to 211, and thereafter southeastern Scotland seems to have enjoyed almost a century of peace. In the 4th century there were successive raids from north of the wall and periodic withdrawals of Roman troops to continental Europe. Despite increasing use of native buffer states in front of the wall, the Romans found their frontier indefensible by the end of the 4th century.

At Housesteads, at about the midpoint of Hadrian’s Wall, archaeologists have uncovered a market where northern natives exchanged cattle and hides for Roman products; in this way some Roman wares, and possibly more general cultural influences, found their way north, but the scale of this commerce was probably small. Roman civilization, typified by the towns and villas, or country houses, of southern Britain, was unknown in Scotland, which as a whole was never dominated by the Romans or even strongly influenced by them.

From about 400 ce there was a long period for which written evidence is scanty. Four peoples—the Picts, the Scots, the Britons, and the Angles—were eventually to merge and thus form the kingdom of Scots.

The Picts occupied Scotland north of the Forth. Their identity has been much debated, but they possessed a distinctive culture, seen particularly in their carved symbol stones. Their original language, presumably non-Indo-European, has disappeared; some Picts probably spoke a Brythonic Celtic language. Pictish unity may have been impaired by their apparent tradition of matrilineal succession to the throne.

The Scots, from Dalriada in northern Ireland, colonized the Argyll area, probably in the late 5th century. Their continuing connection with Ireland was a source of strength to them, and Scottish and Irish Gaelic (Goidelic Celtic languages) did not become distinct from each other until the late Middle Ages. Scottish Dalriada soon extended its cultural as well as its military sway east and south, though one of its greatest kings, Aidan, was defeated by the Angles in 603 at Degsastan near the later Scottish border.

The Britons, speaking a Brythonic Celtic language, colonized Scotland from farther south, probably from the 1st century bce onward. They lost control of southeastern Scotland to the Angles in the early 7th century ce. The British heroic poem Gododdin describes a stage in this process. The British kingdom of Strathclyde in southwestern Scotland remained, with its capital at Dumbarton.

The Angles were Teutonic-speaking invaders from across the North Sea. Settling from the 5th century, they had by the early 7th century created the kingdom of Northumbria, stretching from the Humber to the Forth. A decisive check to their northward advance was administered in 685 by the Picts at the Battle of Nechtansmere in Angus.

Christianity

Christianity was introduced to Scotland in late Roman times, and traditions of the evangelizing of St. Ninian in the southwest have survived. He is a shadowy figure, however, and it is doubtful that his work extended very far north.

Firmly established throughout Scotland by the Celtic clergy, Christianity came with the Scots settlers from Ireland and possibly gave them a decisive cultural advantage in the early unification of kingdoms. The Celtic church lacked a territorial organization of parishes and dioceses and a division between secular and regular clergy; its communities of missionary monks were ideal agents of conversion. The best-known figure, possibly the greatest, is St. Columba, who founded his monastery at Iona, an island of the Inner Hebrides, in 565; a famous biography of his life was written by Adamnan, abbot of Iona, within a century of his death. Columba is believed to have been influential in converting the Picts, and he did much to support the Scots king Aidan politically.

St. Aidan brought the Celtic church to Northumbria in the 630s, establishing his monastery at Lindisfarne. At the Synod of Whitby in 664, the king of Northumbria, having to decide between the Celtic and the Roman styles of Christianity, chose the Roman version. There had been differences over such observances as the dating of Easter, but no one regarded the Celtic monks as schismatics. The Ecclesiastical History of the English People by Bede the Venerable (died 735), a monk of Jarrow in Northumbria, is a first-rate source for the early Anglo-Saxon history and shows remarkable sympathy with the Celtic clergy, though Bede was a Roman monk.

In the early 8th century the church among the Picts and Scots accepted Roman usages on such questions as Easter. Nevertheless, the church in Scotland remained Celtic in many ways until the 11th century. Still dominated by its communities of clergy (who were called Célidé or Culdees), it clearly corresponded well to the tribal nature of society.

The Norse influence

Viking raids on the coasts of Britain began at the end of the 8th century, Lindisfarne and Iona being pillaged in the 790s. By the mid-9th century Norse settlement of the western and northern isles and of Caithness and Sutherland had begun, probably largely because of overpopulation on the west coast of Norway. During the 10th century Orkney and Shetland were ruled by Norse earls nominally subject to Norway. In 1098 Magnus III (Magnus Barefoot), king of Norway, successfully asserted his authority in the northern and western isles and made an agreement with the king of Scots on their respective spheres of influence. A mid-12th-century earl of Orkney, Ragnvald, built the great cathedral at Kirkwall in honour of his martyred uncle St. Magnus.

The Norse legacy to Scotland was long-lasting, but in the mid-12th century there was a rising against the Norse in the west under a native leader, Somerled, who drove them from the greater part of mainland Argyll. A Norwegian expedition of 1263 under King Haakon IV failed to maintain the Norse presence in the Hebrides, and three years later they were ceded to Scotland by the Treaty of Perth. In 1468–69 the northern isles of Orkney and Shetland were pawned to Scotland as part of a marriage settlement with the crown of Denmark-Norway. Nonetheless, a Scandinavian language, the Norn, was spoken in these Viking possessions, and some Norse linguistic influence still remains discernible in Shetland.