Index of Byzantine Empire-related Articles - O

O

• Obelisk of Theodosius
• Octoechos
• Odalar Mosque
• Odo IV, Duke of Burgundy
• Odoacer
• Ohrid
• Olga of Kiev
• Olybrius (consul 491)
• Olympiodorus the Younger
• Olympius (exarch)
• Omurtag of Bulgaria
• Onoulphus
• Opsikion
• Opsites of Lazica
• Optimatoi
• Orhan I
• Orestes (prefect)
• Origen
• Orion of Thebes
• Orphanotrophos
• Orsini family
• Orso Ipato
• Oshin of Lampron
• Osman I
• Osroene
• Ostiarios
• Ostrogothic Kingdom
• Ostrogoths
• Otto I, Holy Roman Emperor
• Otto II, Holy Roman Emperor
• Otto III, Holy Roman Emperor
• Otto, Duke of Brunswick-Grubenhagen
• Ottoman Empire
• Ottoman Empire, Byzantine wars with the
• Ottoman Empire, Rise of the
• Ottoman Interregnum
• Oxford Dictionary of Byzantium