Columbia subject headings:
Harvard subject headings:
Bishops--Byzantine Empire--History.
Byzantine Empire--Church history.
Byzantine Empire--History--1081-1453.
Church history--Middle Ages, 600-1500
Istanbul (Turkey)--Antiquities, Byzantine.
Istanbul (Turkey)--Church history.
Metropolitanates--Byzantine Empire--History.
Orthodox Eastern Church--Byzantine Empire.
Patriarchy--Byzantine Empire--Religious aspects--Catholic Church.
Patriarchy--Religious aspects--Catholic Church
Princeton subject headings:
Bishops--Byzantine Empire--History.
Byzantine Empire--Church history.
Church history--Middle Ages, 600-1500.
Istanbul (Turkey)--Antiquities, Byzantine.
Istanbul (Turkey)--Church history.
Metropolitanates--Byzantine Empire--History.
Orthodox Eastern Church--Byzantine Empire.
Patriarchy--Religious aspects--Catholic Church--Byzantine Empire.