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The steep rock of the Acrocorinth rises to the south-west of ancient Corinth, surmounted by the fortress, also called the Acrocorinth, which was the fortified citadel of ancient and medieval Corinth and the most important fortification work in the area from antiquity until the Greek War of Independence in 1821. It is 575 m. high and its walls are a total of almost 2.000 m. in length.

The ascent to Acrocorinth  Akrocorinthos,  is facilitated by a road which climbs to a point near the lowest gate on the W side. This commanding site was fortified in ancient times and its defenses were maintained and developed during the Byzantine, Frankish, Turkish and Venetian periods. After a moat (alt. 380 m -1247 ft) constructed by the Venetians follow the first gate, built in the Frankish period (14th,c.) and the first wall 15th c. then come the second and third walls (Byzantine: on the the right, in front of the third gate, a hellenistic tower). Within the fortress we follow a path running NE to the remains of a mosque (16th c.) and then turn S until we join a path leading up to the eastern summit, on which there once stood the famous Temple of Aphrodite, worshipped here after the Eastern fashion (views of the hills of the Pelloponnese and of Isthmos).

Courses of roughly dressed polygonal masonry allow us to suppose that the Acrocorinth was fortified as early as the time of the Kypselid tyranny (late 7th c. early 6th c. BC). The surviving parts of the ancient fortifications, however, which are at many points beneath the medieval enceinte, belong mainly to the 4th c. BC. In 146 BC, Mummius destroyed the fortifications of the lower city and the acropolis. The destroyed sections were subsequently reconstructed from the same ancient material in Late Roman times.

During the Middle Ages, the Acrocorinth was of prime importance for the defense of the entire Peloponnese, and held out against the attacks of the barbarians. The Byzantines sporadically repaired the walls, especially after hostile raids (by the Slavs, Normans and others), and added new fortifications on the west side of the fortress. In 1210, after a five-year siege, the Acrocorinth was captured by Otto de la Roche and Geoffroy I Villehardouin, and was incorporated in the Frankish principate of Achaea.In the middle of this century, William Villehardouin extended the fortifications of the fortress, to be followed in this by the Angevin prince John Gravina at the beginning of the 14th c.

In 1358 the Acrocorinth passed to the Florentine banker Niccolo Acciajuoli, and in 1394 to Theodoros I Palaiologos despot of Mystras. Apart from a brief occupation by the Knights of Rhodes from 1400-1404, the fortress remained in Byzantine hands until 1458, when it was captured by the Ottoman Turks. The Venetians made themselves masters of the Acrocornth from 1687 to 1715, after which it reverted once more to the Turks, until the Greek Uprising of 1821. The approach to the fortress is from the west side. The walls have an irregular shape, which was dictated by the form of the terrain and remained the same in general terms from the Classical period to modern times. Three successive zones of fortifications, with three imposing gateways, lead to the interior of the fortress. The fact that the same material was used for extensions or repairs to the walls frequently makes it difficult to distinguish the building phases or assign a date to them.