I don’t know much about the split between rome, and the other patriarchs. how, why, etc…It seems from what I know, that neither actually “left” the other. They simply came to a fork in the road, and each took separate paths.
**
Timeline of the East-West Schism **
of the Catholic and Orthodox Church
davidmacd.com/catholic/orthodox/timeline_history_of_catholic_orthodox_relations.htm
300’s A.D
At the end of the imperial persecutions of Christianity (c. 313), the universal Church is administered by three major ecclesiastical sees: Rome, Alexandria, and Antioch (in that order of primacy). However, by the mid 300’s, there are already significant differences developing between East and West:
- The Roman Empire splits in two: a Western Roman Empire and an Eastern Roman Empire
- The Roman Rite is used in the West; the Antiochian and Alexandrian Rites are used in the East.
- Unleavened bread is used in the Western Eucharist; leaven bread is used in the East.
- The West begins a process toward an all-celibate clergy, based upon the growing East-West trend of electing only celibate monks as bishops.
- The East begins to view the Roman Emperor as the supreme Church authority; even over the primacy (in however one defines it) of the Bishop of Rome. This is somehow related to the influence of the Arians at the imperial court; and most likely developed as a modified form of the old, pagan Emperor worship.
342
At the height of the Arian struggle, the Council of Sardica acknowledges the supreme ecclesiastical authority of Rome, and gives the Roman bishop the right to judge cases involving episcopal sees. The presiding bishop at this council is St. Athanasius himself, who had previously been restored to his see of Alexandria by the authority of Pope Julius I --an authority that is even recognized by the Arians, then in power at Constantinople. Thus, Sardica merely codified Rome’s Traditional primacy as a matter of imperial law.
365
The pious, young Western Emperor Gratian relinquishes the pagan imperial title of Pontifex Maximus (head of the Roman state religion) --a title retained by Emperor Constantine I and his four immediate “Christian” successors. Emperor Gratian bestows the Pontifex Maximus title on Pope Damasus of Rome, making it clear that Christianity is now the official “state cult” of the Empire.
381
With the Arians defeated, the Council of Constantinople proclaims the Bishop of Constantinople (the imperial bishop) second in status to the Bishop of Rome --a decision which Rome refuses to endorse, calling it unTraditional. Rather, citing Canon 6 of Nicaea, Rome upholds the authority of Alexandria as the Traditional second see, and that of Antioch as the third see. It claims that this order of primacy was established by St. Peter himself. Thus, Constantinople is denied the status of a Christian patriarchate.
With the Council’s decree rejected, Eastern Emperor Theodosius I tries to imitate the policy of Western Emperor Gratian by making St. Gregory of Nazianzus, Bishop of Constantinople, the Pontifex Maximus of the Eastern Empire. St. Gregory, however, refuses to accept the title, and soon after resigns the bishopric.
**c. 400 **
The Western Church uses the Athanasian Creed as well as the Nicene and Apostles’ Creeds. The East uses only the Nicene and Apostles’ Creeds.
Around this time, the imperial court of Constantinople moves to make Jerusalem an honorary patriarchate, a status denied to Jerusalem (aka Aelia) by the Council of Nicaea in 325. Although not one of the three original patriarchates established by St. Peter (i.e., Rome, Alexandria, and Antioch), the universal Church gives its approval to the imperial decree so as to venerate the Holy City where Christ died and rose again.
431
The Council of Ephesus deposes Bishop Nestorius of Constantinople for his heretical teaching that Mary was only the mother of Christ’s human nature, but not of His Divine Personhood. Nestorius’ followers break off from the Church and form communities in the Persian Empire known as the Chaldean church --a Nestorian communion, which later spreads into India, forming the Malabar church as well.
449
The Monophysites, who claim that Christ only had one nature --that of God (as opposed to two natures: God and man) are powerful in the Eastern Church. Gaining the Emperor’s support, the Monophysites triumph over the so-called “Robber Council of Ephesus,” and Monophysism is declared to be orthodox doctrine. Numerous orthodox Eastern bishops are deposed, including Bishop Flavian of Constantinople, and appeal to the Pope of Rome to be restored to their sees.