IN the third chapter, occupied with the story of the making of Constantinople, some account has been given of the portion of the landward walls erected in the earlier half of the fifth century, when the city was enlarged under Theodosius II., viz, the portion extending from the Sea of Marmora, on the south, to the ruins of the Palace of the Porphyrogenitus (Tekfour Serai) on the north. That seemed the most appropriate place to speak of the origin and character of fortifications which were built as much for the growth and convenience of the city in its civic relations, as for its security as the citadel of the Empire. To that chapter the reader who desires to recall the information given on the subject, is referred. Here, after a brief account of the additions made to the Theodosian walls, in subsequent times, we shall consider the historical importance of the landward walls as a whole, and glance at some of the scenes enacted before them. The post-Theodosian portions of the walls that guarded Constantinople on the side of the land extend from the courtyard of the Palace of the Porphyrogenitus to the shore of the Golden Horn at Aivan Serai. They replaced an older line of fortifications which ran, at a short distance to the rear, between the same points, and were constructed to strengthen the weak places which time revealed in this part of the city’s armour. First in the order of position, though not in the order of time, comes the wall erected by Manuel Comnenus (1142-1180), for the greater security of the Palace of Blachernæ, his favourite residence, which stood within the old bulwarks, just mentioned. It terminates at the foot of the steep hill on which the quarter of Egri Kapou is situated. With its nine noble towers it presents a striking likeness to the fortifications of a feudal baronial castle, and its solid masonry defied the Turkish cannon in 1453. Then follow walls, the original date of whose construction cannot be precisely determined, as they evidently underwent frequent repairs and alterations. Here is found the Tower of Isaac Angelus, and, in the body of the wall to the north of the tower, are three stories of large chambers, very much ruined, which some authorities regard as the cells of the State Prison of Anemas. More probably, they were either barracks or store-rooms attached to the imperial residence, and at the same time buttresses for the support of the terraced hill on which the palace was built. Beyond this chambered wall there is a double line of fortifications. The inner wall was erected in 627, under Heraclius, after the siege of the city by the Avars, to protect the quarter of Blachernæ and its celebrated Church of S. Mary of Blachernæ more effectively in the future than when assailed by that enemy. The outer wall was built as an additional defence in 813, by Leo the Armenian (813-820), in view of an expected attack upon the city by the Bulgarians under Crum.