The maqsura, located near the minbar, consists of a fence bounding a private enclosure that allows the sovereign and his senior officials to follow the solemn prayer of Friday without mingling with the faithful. Jewel of the art of woodwork produced during the reign of the Zirid prince Al-Mu'izz ibn Badis and dated from the first half of the eleventh century, it is considered the oldest still in place in the Islamic world. It is a cedar wood fence finely sculpted and carved on three sides with various geometric motifs measuring 2.8 metres tall, eight metres long and six metres wide. Its main adornment is a frieze that crowns calligraphy, the latter surmounted by a line of pointed openwork merlons, features an inscription in flowery kufic character carved on the background of interlacing plants. Carefully executed in relief, it represents one of the most beautiful epigraphic bands of Islamic art.