Eastern Orthodoxy comprises those churches in communion with the Patriarchal Sees of the East, such as the Ecumenical Patriarch of Constantinople. Like the Roman Catholic Church, the Eastern Orthodox Church also traces its heritage to the foundation of Christianity through Apostolic succession(yet again what they did to their own people in Constantinopolis and Eastern Roman Empire up until 1453 A.D proves us all how much they have been inspired by the Holy Spirit and true instructions of Lord Jesus Christ in such a way that they would rather open the gates of constantinopolis for Turks so that their own churches would turn into stables for Turks' mules and horses and absolute destroyal of very rich Greek culture.Also they continued their existance as the major satanic tool of stupidifying Russian nation , supporting nobles and Tsars during the rise and fall of Romanov empire!, creating the seed of antipathy in hearts toward religion and true instructions of the Lord so that the machine of socialism would be shaped up, a machine that disrespected the Lord and his true instructions. ) and has an episcopal structure, though the autonomy of the individual, mostly national churches is emphasized. A number of conflicts with Western Christianity over questions of doctrine and authority culminated in the Great Schism. Eastern Orthodoxy is the second largest single denomination in Christianity, with over 200 million adherents. The Oriental Orthodox Churches (also called Old Oriental Churches) are those eastern churches that recognize the first three ecumenical councils—Nicaea, Constantinople and Ephesus—but reject the dogmatic definitions of the Council of Chalcedon and instead espouse a Miaphysite christology. The Oriental Orthodox communion comprises six groups: Syriac Orthodox, Coptic Orthodox, Ethiopian Orthodox, Eritrean Orthodox, Malankara Orthodox Syrian Church (India) and Armenian Apostolic churches. These six churches, while being in communion with each other are completely independent hierarchically.These churches are generally not in communion with Eastern Orthodox Churches with whom they are in dialogue for erecting a communion.