seems to be mistaken, in attributing the Building of this Church to _Justinian_, when it is evident it was built by _Constantine_ the _Great_; and _Procopius_ too grosly flatters _Justinian_ in ascribing to him the Building of many fine Structures, whereas, in reality, he only repair’d them when they were old, or rebuilt them when fall’n too much to decay, or destroy’d by Fire. There’s nothing remaining of this Church at present, no, not even of its Foundation. You see only the Ruines of an old _Cistern_, which supply’d the Church, and the Clergy with Water. There are now standing upon the same Spot of Ground about two hundred _Sadlers Shops_, and _Work-houses_, where they make and sell not only all kinds of Horse-Geer, but also Leathern Bucketts, Quivers, and Trunks. A little above this _Cistern_, stands a Mosque, with a _Caravansera_ adjoining to it, situate on a Plain, which was built with square Stone, after the Form of the Church of St. _Sophia_, out of the Ruins and Sacrilege of the Church of the _Apostles_, and other Christian Churches by _Mahomet_, who took the City. The Roof is of a Semicircular Figure, made of Brick-Work, and cover’d with Lead, as are all the publick Buildings of the _Turks_. ’Tis beautify’d with a very elegant square Porch as broad as the Church itself, pav’d with the finest Marble, and adorn’d with square _Portico’s_. The Arches of them, which bear up the Roof, are supported with very large Pillars of Marble, curiously variegated. In the Middle of it is a Fountain with nine Pipes, whose Waters fall into a great Bason. Round the Mosque is a spacious Court, Part of which is enclos’d with Walls, and Part with long kind of Houses, some of which are inhabited by their Priests, and School-Masters. In the Eastern Part of this Court there’s a Garden, in the Middle of which stands the Sepulchre of _Mahomet_, built in a Cylindric Form of the whitest Marble. ’Tis covered with Lead, lighted with Windows, and has a Door of Entrance into it. In the Middle of this Structure is the Coffin of _Mahomet_, cover’d with Velvet, placed on the Ground on a rich Carpet. The Ground is wholly covered with the most costly Carpets, where the Priests continually sit, and guard the Body Night and Day. A little without the Court are several large _Caravansera’s_, built also with square Stone, which have Court-yards in the Middle of them, and _Portico’s_ surrounded with Marble Pillars. These _Caravansera’s_ have large Gardens adjoyning to them. In short, this Mosque, with the adjacent Buildings round the Court, with the _Caravansera’s_ and Gardens, take up a Space of Ground six Furlongs in Compass. _Mahomet_, the same Emperor, built in this Place, where had formerly been the Old _Cistern_ of _Arcadius_, or _Modestus_, the largest _Bagnio’s_ in all the City. These Baths were of two Kinds, some for Men, and some for Women. They adjoin to each other, but have different Entries without any Passage out of one into the other. I