East Central Europe Christianity West Slavic Great Moravia Svatopluk I East Francia South Slavic states Christianity First Bulgarian Empire Serbian Principality Kingdom Empire Duchy of Croatia Kingdom of Croatia Kievan Rus' Kiev Vladimir the Great Orthodox Christianity Volga Bulgaria Islam Russia largest Balkans Volga
East Central Europe saw the creation of the first Slavic states and the adoption of Christianity (c. 1000 CE). The powerful West Slavic state of Great Moravia spread its territory all the way south to the Balkans, reaching its largest territorial extent under Svatopluk I and causing a series of armed conflicts with East Francia. Further south, the first South Slavic states emerged in the late 7th and 8th century and adopted Christianity: the First Bulgarian Empire, the Serbian Principality (later Kingdom and Empire) and the Duchy of Croatia (later Kingdom of Croatia). To the East, Kievan Rus' expanded from its capital in Kiev to become the largest state in Europe by the 10th century. In 988, Vladimir the Great adopted Orthodox Christianity as the religion of state. Further East, Volga Bulgaria became an Islamic state in the 10th century, but was eventually absorbed into Russia several centuries later.
