Columbia subject headings:
Demetrius Cydones, approximately 1324-approximately 1398--Correspondence.
Harvard subject headings:
Byzantine Empire--History.
Byzantine Empire--Kings and rulers.
Christianity and politics--History--To 1500.
Christianity and religious humanism--History--To 1500.
Demetrius Cydones, approximately 1324-approximately 1398--Correspondence.
Demetrius Cydones, approximately 1324-approximately 1398--Political and social views.
Demetrius Cydones, approximately 1324-approximately 1398.
Emperors--Byzantine Empire--History.
Power (Christian theology)--History--To 1500.
Sovereignty--History.
Princeton subject headings:
Demetrius Cydones, approximately 1324-approximately 1398--Correspondence.