CONSTANTINOPLE was a city of churches. Clavijo, the Spanish envoy, who visited the city in 1403, was assured that it was hallowed by the presence of no less than 3000 sanctuaries, counting large and small. This was obviously an exaggeration, intended to impress the stranger’s mind with a due sense of the city’s grandeur and sacredness. Ducange in his great work, _Constantinopolis Christiana_, gives the names of some 400 churches mentioned by the Byzantine authors whose works he had examined. But a wider acquaintance with Byzantine literature since the time of that great student of the antiquities of Constantinople has discovered the names of many churches not upon his list. It is therefore impossible to reach exact figures here, and we must be content with the vague statement that the number was so large as to form a striking feature of the city’s aspect. This was only what might be expected in a city where the number of churches would be determined not only by the ordinary religious needs of a devout population, but also by the demands of the many monasteries which sought security from violence behind the bulwarks of the capital, notwithstanding the temptations of the world, the flesh, and the devil, encountered there. What does cause surprise, however, is that so few of the numerous churches which once adorned the city, and embodied the piety of its people, have left one stone standing upon another to recall their existence. At most, thirty-five remain, and of these several of them are so dilapidated that they only serve for the identification of an interesting site, or to emphasise the vanity of earthly things.