Columbia subject headings:
Constantinople (Ecumenical patriarchate)--History.
Orthodoxos Ekklēsia tēs Hellados--Turkey--History.
Harvard subject headings:
Constantinople (Ecumenical patriarchate)--History.
Orthodoxos Ekklēsia tēs Hellados--Turkey--History.
Princeton subject headings:
Constantinople (Ecumenical patriarchate)--History.
Orthodoxos Ekklēsia tēs Hellados--Turkey--History.