The door giving access to the minaret is framed by a lintel and jambs made of recycled carved friezes of antique origin. There are stone blocks from the Roman period that bear Latin inscriptions. Their use probably dates to the work done under the Umayyad governor Bishr ibn Safwan in about 725 AD, and they have been reused at the base of the tower. The greater part of the minaret dates from the time of the Aghlabid princes in the ninth century. It consists of regular layers of carefully cut rubble stone, thus giving the work a stylistically admirable homogeneity and unity.