Sousse was an important commercial and military port during the Aghlabid period (800–909) and is a typical example of a town dating from the first centuries of Islam. With its kasbah, ramparts, medina (with the Great Mosque), Bu Ftata Mosque and typical ribat (both a fort and a religious building), Sousse was part of a coastal defence system.
Źródło: World Heritage Convention
http://whc.unesco.org/en/list/498
