Qalʿat ibn Salama (Arabic: قلعة ابن سلامة) is an ancient fortress and archeological site near Tiaret, Algeria. This place is known for having sheltered Ibn Khaldun, an Arab scholar and historian, for four years, between 1375 and 1379. It was here at Qalʿat ibn Salama that he wrote his Muqaddimah (known as Prolegomenon in Greek). This fortress is situated on a mountain top nearby at about three miles south of Frenda in the wilaya of Tiaret.