Great Schism

The East–West Schism (also known as the Great Schism or Schism of 1054) was the break of communion which occurred in the 11th century between the Western and Eastern churches. Immediately following the schism, it is estimated that Eastern Christianity comprised a slim majority of Christians worldwide, with the majority of remaining Christians being Western. The schism was the culmination of theological and political differences which had developed during the preceding centuries between Eastern and Western Christianity.