The Shkumbin River roughly demarcates the Albanian language between Gheg and Tosk dialects. Christianity in Albania was under the jurisdiction of the Bishop of Rome until the 8th century AD. Then, dioceses in Albania were transferred to the patriarchate of Constantinople. In 1054, after the Great Schism, the north gradually became identified with Roman Catholicism and the south with Eastern Orthodoxy. Inhabiting the west of Lake Ochrida and the upper valley of the Shkumbin River, the Albanians established the Principality of Arbanon in 1190 with the capital in Krujë.