This book is about the Byzantine monuments of Istanbul, most notably, Haghia Sophia. The remains of the land and sea walls, the Hippodrome, imperial palaces, commemorative columns, reservoirs and cisterns, an aqueduct, a triumphal archway, a fortified port, and twenty churches are also described in chronological order in the context of their times. These "monuments" are viewed in relationship to the political, religious, social, economic, intellectual and artistic developments of the Byzantine dynasties.