Columbia subject headings:
Constantinople (Ecumenical patriarchate)
Grēgorios VI, Patriarch of Constantinople, 1798-1881.
Patriarchs and patriarchate--Turkey--Istanbul--Biography.
Harvard subject headings:
Constantinople (Ecumenical patriarchate)
Grēgorios VI, Patriarch of Constantinople, 1798-1881
Patriarchs and patriarchate--Turkey--Istanbul--Biography.
Princeton subject headings: