- Byzantine Empire--History--527-1081 (8)
- Balkan Peninsula--History (1)
- Bulgaria--History--681-1018 (1)
- Byzantine Empire--History--1081-1453 (1)
- Byzantine Empire--History--527-1081--Addresses, essays, lectures (1)
- Byzantine Empire--History--To 527 (1)
- Inscriptions, Bulgaro-Turkic--Bulgaria (1)
- Islamic Empire--History--622-661 (1)
- Rome--History--Empire, 284-476 (1)