Columbia subject headings:
Catholic Church--Relations--Orthodox Eastern Church.
John V Palaeologus, Emperor of the East, -1391.
Orthodox Eastern Church--Relations--Catholic Church.
Harvard subject headings:
Catholic Church--Relations--Orthodox Eastern Church.
John V Palaeologus, Emperor of the East, 1332-1391.
Orthodox Eastern Church--Relations--Catholic Church.
Princeton subject headings:
Catholic Church--Relations--Orthodox Eastern Church.
John V Palaeologus, Emperor of the East, -1391.
Orthodox Eastern Church--Relations--Catholic Church.