Constantinople - a large and wealthy city that was an imperial capital of the Byzantine empire and later the Ottoman Empire and now known as Istanbul
Hagia Sophia - The Cathedral of holy wisdom in Constantinople built by the order of the Byzantine emperor Justinian
Justinian- Byzantine empires in the 6th century A.D
Crusaders- A series of holy waters between 1096-1270 A.D undertaken by European Christians to free the holy land from Muslim rulers