The original fortification of the city of Chania, the one that surrounds the hill of Kastelli, has been founded on the remains of an older fortification from the Hellenistic times. Most of the Byzantine wall was built with second-use construction material from ancient Kydonia. Its outline is irregular and consists of straight sections, interrupted by small rectangular or polygonal towers.
The wall in some places simply complements the natural rock fortress, while from the south and part of the east and west sides, it completely covers the need to protect the city. In the wall there were four gates which have been demolished today. The two main gates were the western one towards Syntrivaniou square and the eastern one at the intersection of Canevaros and Daskalogianni streets. The other two smaller ones were one on the south side, at the junction of Katre and Karaoli-Dimitriou streets, and one on the north, at the height of the turkish prisons towards Afenduliyev street.
