1910 New Catholic Dictionary
A title first assumed by John the Faster, bishop of Constantinople (died 595) and vehemently opposed by the popes because it signified "imperial" or "universal" father. The Byzantine prelates persisted in using the title, which is now claimed by the Orthodox Patriarch of Constantinople.
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Entry for 'Ecumenical Patriarch'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/e/ecumenical-patriarch.html. 1910.