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 TOPOGEAPHY OF CONSTANTINOPLE 239 work is disregarded by contemporary writers, and that they speak of the second as the Outer Wall. A second enclosure, called by the Greeks the Parateichion to distinguish it from the Peribolos, exists between the second and the third walls. The foss or ditch, which has withstood four and a half centuries of exposure since it last served as the first line of defence, is still in good condition. It has a width of about sixty feet. The landward wall contained a number of gates which are conveniently described as Civil Gates and which during times of peace gave access to the city over bridges which were destroyed when it was besieged. The most important of these for our present purpose are the Chariseus, the modern Adrianople Gate ; Top Capou or Cannon Gate, known in earlier times as the St. Eomanus Gate, and the Pege or Gate of the Springs, now called Silivria Gate. Besides these there were Military Gates leading from the city through the inner wall into the enclosures which were known in earlier times by their numbers (counting from the Marmora end of the walls) or from the division of the army stationed near them. The most noteworthy of these were the Third or Triton and the Fifth or Pempton. The latter is in the Lycus valley, about halfway between Top Capou and the Gate of Adrianople, and was spoken of during the siege as the St. Bomanus Gate. 1 As the most important military events in the history of the siege of Constantinople took place in the valley of the Lycus, between the Top Capou on the south and the Adria- nople Gate on the north of the valley, it is desirable that the configuration of the locality should be noted carefully. Each of these gates is upon the summit of a hill, the Adrianople Gate indeed being the highest point in the city and, as such, having had near it, as is the almost invariable rule in lands occupied by Greeks, a church dedicated to St. George, who 1 The position of the walls and gates is fully and admirably described in Professor Van Millingen's Byzantine Constantinople, who, however, does not suggest that the Pempton was the Eomanus Gate of the chroniclers of the siege.