The Eastern Orthodox Church, also called the Orthodox Church, is the second-largest Christian church, with approximately 220 million baptized members. It operates as a communion of autocephalous congregations, each

Early Church
Paul and the Apostles traveled extensively throughout the Roman Empire, including Asia Minor, establishing churches in major communities,

Trinity
Orthodox Christians believe in the Trinity, three distinct, divine persons (hypostases), without overlap or modality among them, who each have one divine essence (ousia, Greek: οὐσία)—uncreated, immaterial, and eternal.

Art and architecture
The Archdiocesan Cathedral of the Holy Trinity on New York City's Upper East Side is the largest Orthodox Christian church in the

Definition
The Eastern Orthodox Church is defined as the Eastern Christians which recognize the seven ecumenical councils and usually are in communion with the Ecumenical Patriarchate, the Patriarchate of Alexandria, the

The Eastern Orthodox Church is a fellowship of autocephalous (Greek for self-headed) churches, with the ecumenical patriarch of Constantinople

Church calendar
Lesser cycles also run in tandem with the annual ones. A weekly cycle of days prescribes a specific focus for each day in addition to others that may be observed.
Each day of the Weekly Cycle is dedicated to certain special