The Komnenian Dynasty: Cooperation with the Holy Roman Empire

In 1081 CE, with the attacks from the Normans and Turks reaching their height, a new emperor, Alexios I, came to the throne. His dynasty, the Komnenian Dynasty, would oversee a restoration of the empire after these disasters. But for the first time, the Byzantines would have to look west for help, to their estranged fellow Christians in western Europe. Although western Europe had a history of religious disagreements with the Byzantines, they now realized that the Byzantine Empire was all that was holding back the Muslims from invading Europe.

Having achieved stability in the west, Alexios could turn his attention to the severe economic difficulties and the disintegration of the empire’s traditional defenses. However, he still did not have enough manpower to recover the lost territories in Asia Minor, and to advance against the Seljuks. At the Council of Piacenza in 1095, envoys from Alexios spoke to Pope Urban II about the suffering of the Christians of the east, and underscored that without help from the west, they would continue to suffer under Muslim rule.

Urban saw Alexios’ request as a dual opportunity to cement western Europe and reunite the Eastern Orthodox Churches with the Roman Catholic Church under his rule. On November 27, 1095, Pope Urban II called together the Council of Clermont, and urged all those present to take up arms under the sign of the cross, and launch an armed pilgrimage to recover Jerusalem and the east from the Muslims. The response in western Europe was overwhelming.

Tensions Mount During the First Crusade

Alexios had anticipated help in the form of mercenary forces from the west, but he was totally unprepared for the immense and undisciplined force which soon arrived in Byzantine territory. It was no comfort to Alexios to learn that four of the eight leaders of the main body of the Crusade were Normans, among them Bohemund.

Relations were rocky from the start. To the Byzantines, the crusaders were dirty, uneducated brutes. To the crusaders, the Byzantines were untrustworthy, over-pampered schemers. Still, they tried to work together. The Byzantines and crusaders agreed that whatever formerly Byzantine lands the crusaders recaptured from the Turks would be returned to Byzantine control. The crusaders went back on this agreement, however, and took the lands for themselves. The crusaders succeeded in conquering Jerusalem in 1099 CE, but the Byzantines had come to regard them as just as big a threat as the Muslims.

Still, thanks to the Crusades, the Byzantines were able to reassert control of Anatolia. Emperor Alexios created a new system of leasing land in exchange for military service, called the Pronoia System, which was similar to the old theme system. Under his successors, the Byzantines did not win any major victories, but they were able to keep the Turks out of Byzantium’s Anatolian heartland.

At the same time, in order to secure military aid from the western powers, the Byzantine emperors had granted financial and trade concessions to Italy. Large numbers of Italian merchants settled in Constantinople and put the local merchants out of business. Tensions between them and the Byzantines of the city worsened. In 1182 CE, these tensions spilled over into riots and a massacre of Latins (the people from western Europe) by an angry mob. Tens of thousands were killed.

The recent anti-Latin resentment in the empire led to the Crusader states losing their protection from Byzantium. However, while the Crusader states did not rely on Byzantium for protection, the Byzantines certainly did in that it kept the aggressive expansionism of Islam in check.

Western Europe Sacks Constantinople

In 1198 CE, the pope called a new crusade to permanently secure western Europe’s hold on Jerusalem. When the western Europeans arrived at Constantinople in 1204 CE, they found civil war among the Byzantines. In part sparked by the massacre of the Latins of 1182 CE, and in part motivated by the tempting wealth of Constantinople, the western European knights sacked Constantinople, in what is known as the Fourth Crusade. They pillaged the city, carrying away the vast wealth amassed over nine centuries in the Byzantine capital. For this reason, many great examples of Byzantine art can be found today in Venice, especially at St. Mark’s Cathedral. The sack was a disaster for the Byzantine Empire, which for all purposes ceased to exist. The crusaders parceled out Byzantine lands among themselves. Constantinople became the capital of a new empire, called the Latin Empire, ruled by western knights.

Constantinople was considered as a bastion of Christianity that defended Europe from the advancing forces of Islam, and the Fourth Crusade’s sack of the city dealt an irreparable blow to this eastern bulwark. Although the Greeks retook Constantinople after 57 years of Latin rule, the Byzantine Empire had been crippled by the Fourth Crusade.

Fragmentation of the Byzantine Empire

The Siege of Constantinople in 1204 CE was a turning point in Byzantine history, but it was not the end. Several members of the Komnenian royal family had been away from the capital at the time of the sack, and they declared their own successor states. Each emperor of these states declared himself to be the rightful Byzantine emperor. They fought each other and the Latins for control of the former lands of the Byzantine Empire. It was the Empire of Nicaea, closest to Constantinople, that would be most successful.

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