Catholicos

A catholicos (plural: catholicoi) is the head of certain churches in some Eastern Christian traditions. The title implies autocephaly and, in some cases, it is the title of the head of an autonomous church. The word comes from ancient Greek καθολικός (pl. καθολικοί), derived from καθ' ὅλου (kath'olou, "generally") from κατά (kata, "down") and ὅλος (holos, "whole"), meaning "concerning the whole, universal, general"; it originally designated a financial or civil office in the Roman Empire.^[1]

The Church of the East, some Oriental Orthodox, Eastern Orthodox, and Eastern Catholic churches historically use this title;^[2] for example the Armenian Apostolic Church and the Georgian Orthodox Church. In the Church of the East, the title was given to the church's head, the patriarch of the Church of the East; it is still used in two successor churches, the Assyrian Church of the East and the Ancient Church of the East, the heads of which are known as catholicos-patriarchs. In the Armenian Church there are two catholicoi: the supreme catholicos of Ejmiadzin and the catholicos of Cilicia. The title catholicos-patriarchs is also used by the primate of the Armenian Catholic Church.^[3] In India, an autocephalous Oriental Orthodox Church and the regional head of Jacobite Syrian Orthodox Church (an autonomous Church within Syriac Orthodox Church) use this title. The first is the catholicos of the East and Malankara Metropolitan, and the latter the catholicos of India, but unequally same according to the constitution of the Syriac Orthodox Church and the Jacobite Syrian Christian Church.