http://www.middle-ages.org.uk/the-great-schism.htm
Quote:The Great Schism of 1054 was the split between the Eastern and Western Christian Churches. In 1054, relations between the Greek speaking Eastern of the Byzantine empire and the Latin speaking Western traditions within the Christian Church reached a terminal crisis. This crisis led to the separation between the Eastern and Western churches and is referred to as the Great Schism of 1054. The Christian Church split along doctrinal, theological, linguistic, political, and geographic lines. The split, the Great Schism of 1054, led to the development of the modern Roman Catholic and Eastern Orthodox churches.
