The First Bulgarian Empire was able to defeat the Byzantine Empire in 811 and expand its territory eastward to the Black Sea, south to include Macedonia, and northwest to present-day Belgrade. The kingdom reached its greatest size under Tsar Simeon (893-927), who presided over a golden age of artistic and commercial expansion. After moving deep into Byzantine territory, Simeon was defeated in 924.

Meanwhile, Rome and Byzantium competed for political and cultural influence in Bulgaria. The Eastern Empire won in 870 when Bulgaria accepted Eastern Rite (Orthodox) Christianity and an autocephalous Bulgarian Church was established. This decision opened Bulgaria to Byzantine culture (and territorial ambitions) through the literary language devised for the Slavs by the Orthodox monks Cyril and Methodius. Establishment of a common, official religion also permanently joined the Bulgarian and Slavic cultures.

After reaching its peak under Simeon, the First Bulgarian Empire declined in the middle of the tenth century. Byzantine opposition and internal weakness led to a loss of territory to the Magyars and the Russians. Bulgaria remained economically dependent on the Byzantine Empire, and the widespread Bogomil heresy opposed the secular Bulgarian state and its political ambitions as work of the devil. Seeking to restore a balance of power in the Balkans, the Byzantines allied with the Kievan Russians under Yaroslav and invaded Bulgaria several times in the late tenth century. Although the Bulgarians expanded their territory again briefly under Tsar Samuil at the end of the tenth century, in 1014 the Byzantines under Basil II inflicted a major military loss. By 1018 all of Bulgaria was under Byzantine control. For nearly two centuries, the Byzantines ruled harshly, using taxes and the political power of the church to crush opposition. The first and second Crusades passed through Bulgaria in this period, devastating the land.

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Source: U.S. Library of Congress