Eastern Orthodoxy is a significant branch of Christianity, which developed in the eastern part of the Roman Empire. It represents the faith's traditional teachings and beliefs, and has several synonyms to describe its various characteristics. Byzantine Orthodoxy is an alternate name, which highlights its development within the Byzantine Empire. Greek Orthodoxy emphasizes the Greek language used in the liturgy and theology. Russian Orthodoxy refers to the significant number of ethnic Russians who practice the faith. Eastern Catholicism is often used to describe the orthodox churches that have reconciled with the Roman Catholic Church; they retain their Orthodox traditions while being in communion with the Pope. Ultimately, all of these terms represent the unique perspectives and traditions of one of the world's most historic Christian faiths.