The mosque consists of a large
hypostyle prayer hall, which takes up most of the space, and a much smaller rectangular courtyard (
sahn) in the northeast part of the mosque.
Prayer hall The prayer hall is composed of 9 naves or aisles perpendicular to the qibla wall (the south wall), divided by rows of arches supported by reused ancient columns (as was the case in the original Aghlabid structure). The hall was probably covered by a flat wooden ceiling originally, but these have since been replaced with masonry
groin vaults. The 5 eastern naves were part of the older Zirid-era mosque, while the 4 western ones are part of the later re-enlargement of the mosque. In the eastern section, each nave runs is 6 bays long (i.e. the length of 6 arches). In the western section, the hypostyle naves run the whole length of the mosque, except for the slightly truncated corner where the present day street passes. The central mihrab of the mosque, dating to the 18th-century renovations, is
fluted or grooved on the inside and is decorated with
Kufic Arabic inscriptions. Above the mihrab is a commemorative inscription by the poet 'Ali al-Ghurab. The former Zirid mihrab, further east, has been reopened after being walled off for many years. The little original decoration that it retains suggests it was probably like the mihrab found in the
Great Mosque of Mahdia. File:Salle de prière à l'intérieur de la Grande mosquée de Sfax 02.JPG|Inside the prayer hall File:Salle de prière à l'intérieur de la Grande mosquée de Sfax 06.JPG|Groin-vaulted ceiling of the prayer hall File:Grande Mosquée de Sfax 05.jpg|The central mihrab of the mosque (18th century) File:Grande Mosquée de Sfax 06.jpg|The former Zirid-era mihrab of the mosque (10th
–12th century)
Courtyard The courtyard is surrounded on all four sides by an
arcaded gallery also covered by groin vaults. On the south side is a kind of "
narthex" that leads to the prayer hall, five bays wide. Its central bay projects slightly outward into the courtyard and is covered by a dome. Unlike older Aghlabid domes, the dome does not rest on an octagonal
drum. The piers supporting this dome are adjoined by columns, and the western pier facing the courtyard (on the right when looking towards the prayer hall) is partly covered by a tall marble plaque carved in the shape of an arch with Kufic inscriptions. This plaque served as a kind of outdoor
mihrab for those performing prayers in the courtyard, similar to an
anaza. It has been attributed to the Fatimid period (10th century) based on the style of the Kufic script. The wooden doors that grant entry from the narthex to the prayer hall were crafted by a master carpenter named Ahmed Sha'abuni. They ornately carved with geometric and vegetal motifs and were originally painted with colours.
Minaret The minaret, a thick
cuboid tower built in the Zirid period around the original Aghlabid minaret, rises from the corner of the courtyard, near the middle of the mosque's northern edge. The original minaret also had a square base but it measured only 4.2 metres per side and it rose to a possible height of 20 metres. The present minaret is quite different from contemporary minarets of the Fatimid-Zirid period and its shape evokes instead the 9th-century minaret of the Great Mosque of Kairouan. It is roughly 25 metres tall. Like the latter, it is composed of three tiers. The first tier, the largest, is three stories tall and is pierced by a door on the ground floor and a window on each of the floors above. The windows have mixtilinear shapes (a mix of straight and curved lines). The top of the shaft is crowned by several horizontal bands of decoration: a cornice of triangular
dentils, a
frieze of recessed circles, an elegant Kufic inscription frieze, and, at the top, a line of ornate pierced
merlons. The merlons recall a similar form of decoration found in the
Mosque of Ibn Tulun and in
Fatimid mosques in
Cairo. This decoration is repeated for the second tier of the minaret, which rises one story. The last tier at the summit is a thin lantern-like structure open on four sides, with
engaged colonettes at its corners, and topped by a dome. File:Grande mosquée de Sfax (Tunisie) 30.jpg|The minaret, seen from the courtyard File:Grande mosquée de Sfax minaret.jpg|Detail of decoration of the minaret's first tier File:Grande mosquée de Sfax (Tunisie) 01.jpg|Detail of decoration around the top of the minaret
Eastern façade The exceptional eastern exterior façade of the mosque is embellished with a series of decorative horseshoe arch-shaped niches or recesses above the doors and windows. Some of them contain Arabic inscriptions. This façade may be from the original 9th-century mosque but its unique and unusual appearance may date it to a later period. Multiple scholars attribute it to the Zirid period, including
Lucien Golvin and Georges Marçais. In addition to the overall composition, another unusual feature is the reuse of a
Byzantine marble panel with Christian votive themes set into the wall above one of the windows. The panel is carved with an image of two
peacocks facing each other (partly erased by chisel at some unknown date) against a background of foliate motifs and with a
Greek inscription above. The incomplete inscription appears to have been part of an invocation of God, Christ, or the
Virgin Mary. This incorporation of a Christian work of art with
figural motifs so clearly on a mosque is difficult to explain, but may have been possible due to Fatimid tolerance of unorthodox expressions or due to the existence of local patrons of Byzantine ancestry who chose to reuse this panel. As the inscription no longer names the Christian figure to which it was dedicated, it may have been compatible with a general religious message for the mosque. File:Grande mosquée de sfax 11.jpg|The exterior eastern façade of the mosque File:Inscription, Grande Mosquée de Sfax.jpg|Inscription plaque in one of the recessed arches File:Les arabesques de la grande mosquée 4.jpg|Another inscription on the façade File:Grande mosquée de Sfax (Tunisie) 48.jpg|Byzantine marble panel in the eastern façade ==See also==