The Great Schism, also known as the Great Schism of 1054 or the East-West Schism was the schism by which the Roman Catholic Church and the Eastern Orthodox Church separated. This was such a long-running argument that they excommunicated each other in 1054, and only ended the mutual anathema in 1965. Rome suppressed the use of Greek and the Orthodox suppressed Latin - setting scholarship back a long way especially in the Roman half. The result of the schism was that they were two separate churches by the time of the Crusades.