Built on a rectangular plane 125 m long and 75 m wide, the building consists of a courtyard and a 137 m x 37 m portico entrance, divided into 17 straits and 8 bays. The encounter between the central strait and the bay along the wall of Qibla forms a square area in front of the mihrab. Above this square is a grooved dome attached to a carved stone crevice. These are decorated with shell and polyfoil rosette motifs inspired by the Umayyad repertoire. Numerous pillars and ancient capitals in the gallery surrounding the chapel and courtyard form the largest collection of Islamic monuments and museums in the Roman and Byzantine capitals. Despite the continuous restoration of the 8th and 9th centuries (14th and 15th AD), some beautiful beams remain on the wooden roof of the chapel. Dating to 3 AH / 9th century AD, it is decorated in a Greek style with spear-shaped fruits wrapped in symmetrical palm leaves.