Catholicos of the East is the title that has been held by the ecclesiastical heads of the Church of the East, the Grand Metropolitan of Seleucia-Ctesiphon, since AD. 280.
The term "Catholicos" is derived from the Greek word Katholikos (Καθολικός), meaning "Universal Bishop". The title Catholicos, is used in several Eastern Christian churches and implies a degree of sovereignty and autocephaly.
Catholicos of the East historically refers to:
In a wider perspective, it may also refer to: