Between these two walls was the Peribolos or enclosure, which, though of varying width, is usually between fifty and sixty feet broad. Outside the second was yet another wall, which was a continuation in height of the scarp or inner wall of the ditch or foss and which may conveniently be called a breastwork. This breastwork, like the other two, was crenellated. Though, from the fact that it has been easier of access than either of the others, the summit has mostly perished, some portions of it are still complete. It is important, however, to note that the third wall or breastwork 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. Romanus Gate, and the Pegè 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. Romanus Gate.[241]