Ecumenical Patriarchate
The archbishop of Constantinople emerges as the center of the church in the eastern Mediterranean due to its proximity to the political leadership of the Roman Empire. As the territory under its jurisdiction expanded, additional bodies of believers were distinguished from the Greek-speaking Ecumenical Patriarchate by the language spoken and the alphabet (especially Slavic) used in the liturgy. Constantinople was recognized as a Patriarchate in 371 and later designated as second only to Rome (Chalcedon, 451).