The facade, seven meters high, is the most remarkable component of the building. Considered one of the most beautiful specimens of Islamic architecture, it constitutes a veritable inventory of the Kairouan decorative repertoire during the Aghlabid period1. Its layout, axial and symmetrical, comprises three paired and horseshoe arches which rest on reused antique columns; the middle one is taller and wider than the other two. The spandrels of the arches are decorated with an exuberant decoration of scrollwork interwoven with stylized three- or five-lobed vine leaves which recall the decoration of the painted wooden half-dome of the mihrab of the Great Mosque of Kairouan.