Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History--Andronicus II Palaeologus, 1282-1328.
Byzantine Empire--History--Andronicus III Palaeologus, 1328-1341.
Byzantine Empire--History--John V Palaeologus, 1341-1391.
John VI Cantacuzenus, Emperor of the East, 1292-1383.
Princeton subject headings:
Byzantine Empire--History.