The split between the eastern church hand the western church became known as

Some of the factors from the split was,

Language differences, church authority, priests right to marry and divorce.

Charlemagne's crowning made the Byzantine Emperor redundant, and relations between the East and the West deteriorated until a formal split occurred in 1054. The Eastern Church became the Greek Orthodox Church by severing all ties with Rome and the Roman Catholic Church - - - from the pope to the Holy Roman Emperor on down.