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Eastern Orthodox Christianity, Christianity, and Catholic.
Both the Eastern Orthodox and the Western Catholic branches of Christianity claim to have the same 'pillars' of religious foundations.
Roman Catholic, Eastern Orthodox, and Protestant.
At first it was the Roman Catholic branch and then came the Eastern Orthodox.
The two churches were the Eastern Orthodox and the Roman Catholic
Eastern Orthodox, although there is a significant catholic minority as well.
Eastern Orthodox is a branch of Christianity.
Christianity can be divided into three parts: the Roman Catholic Church, the Eastern Orthodox Church, and Protestantism. The Roman Catholic Church and Eastern Orthodox Church split in the 11th Century. Protestantism was born from Reformation in the 16th Century and split from the Roman Catholic Church at that time.
The peoples were Asians that migrated into Eastern Europe, and there religions were Christianity.
Eastern Europe is mostly Orthodox, which is a branch of Christianity (Greek Orthodox and Russian Orthodox are some examples). However, there are also large Catholic populations throughout.
Rome and Constantinople became centers of Christianity. Rome became the center of Western Catholic Christianity and Constantinople became the center of Eastern, Orthodox Christianity
The Byzantine Empire's dates run from  A.D. 330 – 1453. Until the Eastern Orthodox Churches split from the Catholic Church in A.D. 1054 there were no "branches" of Christianity, there was only the Catholic Church.