Eastern Orthodox Church

The Eastern Orthodox Church is the second-largest Christian church, with approximately 220 million baptized members.

An excerpt from the article 18 facts about Eastern Orthodox Church

It operates as a community of autocephalous congregations, each governed by its bishops. The Orthodox Church has no central doctrinal or governmental authority analogous to the Head of the Roman Catholic Church, the pope.

The Ecumenical Patriarch of Constantinople is considered primus inter pares ("first among equals") and is regarded as the spiritual leader of many Eastern Christian parishes.