* The [[Orthodox Church]]es (approx. 300 million baptized members) trace their roots back to the Apostles, in the five ancient [[patriarchate]]s of the undivided Church of the first millennium of her history, known as the [[Pentarchy]],<ref>[https://orthodoxwiki.org/Pentarchy Pentarchy (orthodoxWiki.org)]</ref> and are organized in [[Autocephalous]] national or regional churches in communion with each other. The Pentarchy consisted of the Churches of [[Church of Rome|Rome]], first in dignity of honor, [[Church of Constantinople|Constantinople]], [[Church of Alexandria (Coptic)|Alexandria]], [[Church of Antioch|Antioch]], and [[Church of Jerusalem|Jerusalem]]. Differing theological perspectives and the growing development of the doctrine of [[Petrine primacy]] in the Church of Rome led to the [[Great Schism]] between the Roman Catholic Church and the Eastern Orthodox Churches in A.D. 1054. | * The [[Orthodox Church]]es (approx. 300 million baptized members) trace their roots back to the Apostles, in the five ancient [[patriarchate]]s of the undivided Church of the first millennium of her history, known as the [[Pentarchy]],<ref>[https://orthodoxwiki.org/Pentarchy Pentarchy (orthodoxWiki.org)]</ref> and are organized in [[Autocephalous]] national or regional churches in communion with each other. The Pentarchy consisted of the Churches of [[Church of Rome|Rome]], first in dignity of honor, [[Church of Constantinople|Constantinople]], [[Church of Alexandria (Coptic)|Alexandria]], [[Church of Antioch|Antioch]], and [[Church of Jerusalem|Jerusalem]]. Differing theological perspectives and the growing development of the doctrine of [[Petrine primacy]] in the Church of Rome led to the [[Great Schism]] between the Roman Catholic Church and the Eastern Orthodox Churches in A.D. 1054. |