Catholicos | Eastern Orthodox, Patriarch & Ecumenical
https://www.britannica.com/topic/catholicos
WebSt. Isaac the Great (born c. 345—died probably September 7, 439, Ashtishat, Armenia; Western feast day September 9; Eastern feast day November 20 (or 25); Armenian feast day February 10 (or two weeks before Lent). ) was a celebrated catholicos, or spiritual head, of the Armenian Apostolic Church. He was a principal advocate of Armenian ...
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