structural:summarization, information:classification
Later councils

Thus in little more than a hundred years the structural arrangement by provinces envisaged by the First Council of Nicaea was, according to John H. Erickson, transformed into a system of five large divisions headed by the bishops of Rome, Constantinople, Alexandria, Antioch, and Jerusalem. He does not use for these divisions the term patriarchate because the term patriarch as a uniform term for the heads of the divisions came into use only in the time of Emperor Justinian I in the following century, and because there is little suggestion that the divisions were regarded as quasi-sovereign entities, as patriarchates are in Eastern Orthodox ecclesiology. Because of the decision of the Council of Ephesus, Cyprus maintained its independence from the Antioch division, and the arrangement did not apply outside the empire, where separate "catholicates" developed in Mesopotamia (Church of the East) and Armenia (Armenian Church).