Columbia subject headings:
Orthodox Eastern Church--Byzantine Empire--Bishops--Biography.
Orthodox Eastern Church--Doctrines--Early works to 1800.
Photius I, Saint, Patriarch of Constantinople, approximately 820-approximately 891--Correspondence.
Harvard subject headings:
Orthodox Eastern Church--Byzantine Empire--Bishops--Biography.
Orthodox Eastern Church--Doctrines--Early works to 1800.
Photius I, Saint, Patriarch of Constantinople, approximately 820-approximately 891--Correspondence.
Princeton subject headings:
Orthodox Eastern Church--Byzantine Empire--Bishops--Biography.
Orthodox Eastern Church--Doctrines--Early works to 1800.
Photius I, Saint, Patriarch of Constantinople, approximately 820-approximately 891. Correspondence.