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Great Schism
From A Storehouse of Knowledge
The Great Schism in 1054 was the definitive break which divided Medieval Christendom between East and West along essentially the same line that divided the original Roman Empire between Latin-speaking and Greek-speaking halves. Catholicism retained its center in Rome, while the Eastern Orthodox Church looked to the bishop of Constantinople (modern Istanbul) for leadership. As a result, only the first seven ecumenical Church councils are accepted by both sides.
