The concept of Christendom

By the 10th century the religious and cultural community known as Christendom had come into being and was poised to enter a prolonged period of growth and expansion. Important progress had taken place well before this period, however. Beginning in the last years of the Roman Empire, the central institutions of medieval Catholic Christianity had gradually evolved, laying the foundation for the great advances of the later Middle Ages and beyond.

One of the most significant developments of the late ancient and early medieval periods—for Roman Catholicism and all forms of Christianity—was the emergence of Christian theology. In the 2nd and 3rd centuries, Christian apologists attempted to explain their faith to their non-Christian contemporaries in the philosophical vocabulary of the age; among the most outstanding of such scholars was Origen (c. 185–c. 254), who developed a thoroughgoing Christian Neoplatonism. It was not until the 4th and 5th centuries, however, that the basic Christian doctrines were established. The Council of Nicaea and subsequent councils formulated the doctrines concerning the nature of the Godhead and the person of Christ. Subsequently, a number of Christian thinkers—the Latin Church Fathers—provided commentary on a wide range of issues, including the meaning of the sacraments, the Trinity, soteriology, eschatology, and ecclesiology. The most prominent and influential of these early theologians was St. Augustine of Hippo (354–430). His teachings on the sacraments, salvation, and the Trinity remained the starting point of discussion for Christian thinkers throughout the Middle Ages and beyond, and his monumental City of God (413–426/427) provided a Christian philosophy of history and a new way to understand human society and its relationship to God. Augustine’s works were a model of learned and elegant Latin style, as were the sermons of St. Ambrose (339–397), whose reputation for sanctity and celibacy—as well as his excommunication of Theodosius in 390—set important precedents. Another Church Father, St. Jerome (c. 347–419/420), produced a Latin translation of the Bible—the Vulgate—that would serve as the standard text for centuries to come. Later ecclesiastics, including Caesarius of Arles (c. 470–542) and Isidore of Sevilla (c. 560–636), produced a formidable body of Christian commentary and other scholarship that built upon the foundation of the Latin Church Fathers.

During the late ancient and early medieval periods there was also a significant growth in monasticism, the origins of which are traditionally associated with the Apostles in Jerusalem. Although the Apostles were thought to be the precursors of Christian monastics, they were not the founders of the movement, which began in Egypt with St. Anthony (c. 290–356). In imitation of Jesus’ wandering in the desert and to combat the temptations of the Devil, Anthony undertook a life of isolation, asceticism, contemplation, and piety that inspired numerous imitators. These first monks often went to great extremes in their acts of self-abasement before God, and their eremitic lifestyle remained the ideal for religious persons until the introduction of cenobitic, or communal, monasticism by St. Pachomius (c. 290–346) in the early 4th century. Among the many advocates of monasticism were St. Basil the Great (329–379), the father of Eastern monasticism, and St. John Cassian (360–435), whose writings were influential in the development of Western monasticism. The true father of Western monasticism, however, was St. Benedict of Nursia, whose rule was noted for its humanity and flexibility. The Rule of St. Benedict was the standard monastic rule in the Western church by the 9th century, and it served as the basis for the later Cluniac and Cistercian reform movements.

During the early Middle Ages, tensions between Rome and Constantinople increased, leading ultimately to the Schism of 1054. Separated by language (Latin and Greek, respectively) and liturgy, the Western and Eastern churches were divided further in the early 8th century by the imperial program of iconoclasm (the prohibition of the veneration of images of Christ and the saints), increased taxation of Rome by Constantinople, and the Byzantine emperor’s failure to protect the papacy and its territories from the depredations of the Lombard invaders. Angered by these developments, Pope Gregory III (reigned 731–741) sought an alliance with the Carolingian mayor of the palace, Charles Martel (c. 688–741). Although no agreement was reached, the initiative set the stage for a revolution in papal diplomacy and in the institutional orientation of the church at Rome. By the end of the 8th century, the church had become a fully Western entity, severing its alliance with the emperors in Constantinople and establishing a new alliance with the Carolingian dynasty (established in 751). The alliance played a critical role in the growth of the papal states. The establishment of the Carolingian-papal bond and the coronation of the first Carolingian king also provided the occasion for the composition of one of the great forgeries of the Middle Ages, the Donation of Constantine (generally thought to have been written in the mid-750s), which was based on pious legends that had been known since the 5th century and was subsequently used to justify papal claims of primacy. Although the formal break between the two churches did not come until three centuries later, differences over the insertion of the Filioque (Latin: “and from the Son”) clause in the creed, which confirmed that the Holy Spirit proceeds from the Father and the Son, and the failure to invite a Carolingian representative to the Second Council of Nicaea further heightened tensions between East and West.

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The Carolingian period is widely recognized as the high point in the development of the early medieval church. Beyond their alliance with the papacy, Carolingian rulers instituted a number of church reforms and began a cultural revival that directly influenced religious life. Many of the most important reforms were implemented by the greatest of the Carolingians, Charlemagne, and were intended to reestablish the proper organization of the episcopal hierarchy and to abolish the drunkenness, sexual immorality, and ignorance of the clergy. His royal and imperial decrees mandated the establishment of monastic and cathedral schools to teach both the laity and the clergy so that the fundamentals of the faith would be known to all. He attracted religious scholars to his court and rewarded them with important ecclesiastical posts. Charlemagne also presided over church councils that combated heresy, reformed the behavior of the clergy, and defined church teaching. His efforts bore fruit in the 9th century, when theologians discussed the question of predestination and began the debate—which would reach its culmination in the 13th century—over the exact nature of the real presence of Christ in the Eucharist.

Well before Charlemagne’s coronation, the papacy had made overtures to Carolingian rulers. Although Charles Martel rejected papal pleas for help, he did support the missionary activity of the Anglo-Saxon monk Boniface (c. 675–754), whose preaching to the Saxons and reform of the Frankish church was sanctioned by Rome. Boniface’s ties to Rome contributed to the growing interest in that city and to the devotion to St. Peter that characterized religious belief in the kingdom and especially in the Carolingian house. The relationship with Rome was formalized by Charlemagne’s father, Pippin III (died 768), who usurped the Frankish throne with papal approval and was later crowned king by the pope. But the event of greatest significance for relations between the papacy and Carolingian rulers was Charlemagne’s coronation as emperor of the Romans by Pope Leo III (reigned 795–816). With few exceptions, during the rest of the Middle Ages emperors were created by papal coronation. The destinies of the two institutions were thus inextricably linked. This development contributed to contemporary understandings of the proper relationship between church and state and even to understandings of the church itself; it also led to controversy between later emperors and popes over the matter of universal authority in Christendom.

A period of decadence

The advances made in church organization and in reformation of religious life could not be sustained in the post-Carolingian world. Indeed, the 10th century has traditionally been regarded as a period of decay and corruption within the church. As a result of the breakup of the Carolingian empire and a new wave of invasions, the church suffered materially and spiritually as both Christian and non-Christian warriors exploited it and its wealth. The monasteries suffered most during this period, but the general turmoil of the time contributed to the failure of the church to maintain the discipline and integrity of religious life. The laity suffered from the ignorance of rural priests, and clerics of all ranks were guilty of concubinage and other abuses.

The papacy itself offers the best example of the abysmal situation of the church in the 10th and 11th centuries. The decline of Carolingian power left it without a protector and once again subject to the whims of the local aristocracy, who struggled among themselves for control of the office and its extensive territories in central Italy. The popes appointed by Italian nobles were sometimes violent and debauched and did little more than promote their family interests. Ill-suited for any pastoral role, they were sometimes not even priests when appointed; according to tradition, one new pope, Benedict IX, was an adolescent boy. Some of these popes had mistresses and children, and many came to power through bribery or other illicit means. Even imperial intervention beginning in the late 10th century failed to bring an end to papal corruption, because local families reasserted their control over Rome during imperial absences.

Despite the decadence of this period, a number of developments offered promise for the future. Even the papacy enjoyed periods of renewed vigor during these dark times. Popes Leo VII (reigned 936–939) and Agapetus II (reigned 946–955) were active reformers, and Benedict VIII (reigned 1012–24) issued legislation against simony. During the papacy of Sylvester II (reigned 999–1003), who was recognized as the most learned man of his time, the dignity of the office was briefly restored. Moreover, no matter how depraved the reigning pope may have been, Rome remained the spiritual capital of the Western church. Since at least the Carolingian period, devotion to St. Peter had been growing throughout Europe, and it remained an important characteristic of religiosity in the 10th and 11th centuries. Peter’s growing prestige attracted numerous pilgrims to Rome, even during times when his successor was devoid of any virtue.

The evolution of the church was also influenced by events outside Rome. One of the most important of these was the resurrection of imperial authority and the Carolingian ideal of government by the German king Otto I (912–973). Under him the bishops and greater abbots were drawn into royal service and enriched with estates and counties, for which they paid homage. Otto conquered northern Italy and was crowned emperor in 962 by Pope John XII (reigned 955–964). In the following year, Otto deposed the pope for immoral behavior (tradition holds that John died of a stroke while in bed with a woman). Both Otto and his grandson Otto III (980–1002) appointed and removed popes, presided at synods, and extended their authority over the church. Otto III, an enlightened ruler, appointed as pope his former tutor—Gerbert of Aurillac, who took the name Sylvester II—with the intention of reviving a Christian Roman empire. Otto’s death at an early age ended that dream, and the papacy became mired in local politics for the next half century until another German ruler intervened in its affairs.

The revival of imperial power in Germany would have lasting influence on the development of the church, as would the foundation of the reformed monastery of Cluny in Burgundy in 909. Indeed, the first stirrings of the great reform movement that transformed the church in the 11th century are thought to have taken place at Cluny. Established by Duke William I, the Pious, of Aquitaine, Cluny rose to prominence under the direction of abbots Odo, Odilo, and Hugh, who were the spiritual leaders of their age. From its beginning, Cluny enjoyed close ties with Rome because William placed the monastery under the protection of St. Peter and St. Paul and the pope. William also ensured Cluny’s independence by forbidding any secular or religious authority from interfering in its affairs. Cluny developed a reputation as the highest form of religious life—indeed, as a paradise on earth—and its abbots spread Cluniac practices by reforming other monasteries. Cluniac monks lived strictly canonical lives, opposing simony and clerical unchastity. They also participated in an elaborate liturgical routine, singing the monastic hours (liturgical or devotional services for use at certain hours of the day, according to the monastic daily schedule) and offering prayers for the dead and the monastery’s numerous benefactors. Cluny was not the only reformed house—Gorze was the most notable of several others—but it was the greatest, and the ideals it embodied set an important precedent.