Canonical territories are geographical subdivisions that mark the boundaries of the jurisdiction of local orthodox churches on the one hand and the Roman Catholic Church on the other. Eastern Orthodoxy (also called Greek Orthodoxy and Russian Orthodoxy) is a Christian tradition which represents the majority of Eastern Christianity. ... The Roman Catholic Church or Catholic Church (see Terminology below) is the Christian Church in full communion with the Bishop of Rome, currently Pope Benedict XVI. It traces its origins and sees itself as the same Church founded by Jesus of Nazareth and maintained through Apostolic Succession from the Twelve...

References

• One City, One Bishop, One Church. The Principle of Canonical Territory and the Appearance of "Parallel Hierarchies".