Yes there is, with the highest ranking bishop being the Patriarch of Constantinople. It's important to note that the patriarch does not hold the same kind of position as the pope. He is not an absolute leader who claims to be infallible. He is merely the first among equals
No, the Greek Orthodox church is a part of the Eastern Orthodox Churches.
The Russian Orthodox, Serbian Orthodox, and Carpatho-Russian churches
also known as the Orthodox Christian Church of Russia, is a body ofChristians who constitute an autocephalous Eastern Orthodox Church under the jurisdiction of the Patriarch of Moscow, in communion with the other Eastern Orthodox Churches. The ROC is often said[5] to be the largest of the Eastern Orthodox churches in the world
Some Orthodox Churches use the new Gregorian calendar, but most Orthodox Churches continue to use the old Julian calendar.
Russian orthodox. Greek orthodox. Coptic orthodox. Antiochia orthodox. Eastern orthodox. Ethiopian orthodox.
the Eastern Orthodox Church and the Roman Catholic Church
Uniate
uniate
The two churches were the Eastern Orthodox and the Roman Catholic
The Orthodox Churches and the Catholic Church were once united. The Orthodox Churches separated from the Catholic Church over political and doctrinal differences.
The oriental orthodox,eastern orthodox and roman catholic churches all started when various apostles spread mainly the middle east and eastern Europe. Soon the churches started to split the oriental orthodox then eastern orthodox and catholics together. Its hard to say when oriental orthodox started because it consists of several apostolic churches in communion which each other all founded at different times by different apostles
Catholic.