CIty Walls

The walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (modern Fatih district of Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built.

Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger. They saved the city, and the Byzantine Empire with it, during sieges by the Avar–Sassanian coalition, Arabs, Rus', and Bulgars, among others. The fortifications retained their usefulness even after the advent of gunpowder siege cannons, which played a part in the city's fall to Ottoman forces in 1453 but were not able to breach its walls.

The walls were largely maintained intact during most of the Ottoman period until sections began to be dismantled in the 19th century, as the city outgrew its medieval boundaries. Despite lack of maintenance, many parts of the walls survived and are still standing today. A large-scale restoration program has been underway since the 1980s.

According to tradition, the city was founded as Byzantium by Greek colonists from the Attic town of Megara, led by the eponymous Byzas, around 658 BC. The city then consisted of a small region around an acropolis located on the easternmost hill (corresponding to the modern site of the Topkapı Palace). According to the late Byzantine Patria of Constantinople, ancient Byzantium was enclosed by a small wall that began on the northern edge of the acropolis, extended west to the Tower of Eugenios, then went south and west towards the Strategion and the Baths of Achilles, continued south to the area known in Byzantine times as Chalkoprateia, and then turned, in the area of the Hagia Sophia, in a loop towards the northeast, crossed the regions known as Topoi and Arcadianae and reached the sea at the later quarter of Mangana. This wall was protected by twenty-seven towers and had at least two landward gates, one which survived to become known as the Arch of Urbicius, and one where the Milion monument was later located. On the seaward side, the wall was much lower. Although the author of the Patria asserts that this wall dated to the time of Byzas, the French researcher Raymond Janin thinks it more likely that it reflects the situation after the city was rebuilt by the Spartan general Pausanias, who conquered the city in 479 BC. This wall is known to have been repaired, using tombstones, under the leadership of a certain Leo in 340 BC, against an attack by Philip II of Macedon.

Byzantium was relatively unimportant during the early Roman period. Contemporaries described it as wealthy, well peopled and well fortified, but that affluence came to an end because the city supported Pescennius Niger (r. 193–194) in his war against Septimius Severus (r. 193–211). According to the account of Cassius Dio, the city held out against Severan forces for three years, until 196, with its inhabitants resorting even to throwing bronze statues at the besiegers when they ran out of other projectiles. Severus punished the city harshly: the strong walls were demolished, and the town was deprived of its civic status, being reduced to a mere village dependent on Heraclea Perinthus. However, appreciating the city's strategic importance, Severus eventually rebuilt it and endowed it with many monuments, including a Hippodrome and the Baths of Zeuxippus, as well as a new set of walls, located some 300–400 m to the west of the old ones. Little is known of the Severan Wall save for a short description of its course by Zosimus and that its main gate was located at the end of a porticoed avenue (the first part of the later Mese) and shortly before the entrance of the later Forum of Constantine. The wall seems to have extended from near the modern Galata Bridge in the Eminönü quarter south through the vicinity of the Nuruosmaniye Mosque to curve around the southern wall of the Hippodrome, and then going northeast to meet the old walls near the Bosporus. The Patria also mentions the existence of another wall during the siege of Byzantium by Constantine the Great during the latter's conflict with Licinius, in 324. The text mentions that a fore-wall (proteichisma) ran near the Philadelphion, located at about the middle of the later, Constantinian city, suggesting the expansion of the city beyond the Severan Wall by this time.