The portico on the south side of the courtyard, near the prayer hall, includes in its middle a large dressed stone pointed horseshoe arch which rests on ancient columns of white veined marble with Corinthian capitals. This porch of seven metres high is topped with a square base upon which rests a semi-spherical ribbed dome; the latter is ribbed with sharp-edged ribs. The intermediary area, the dodecagonal drum of the dome, is pierced by sixteen small rectangular windows set into rounded niches. The great central arch of the south portico, is flanked on each side by six rhythmically arranged horseshoe arches, which fall on twin columns backed by pillars. Overall, the proportions and general layout of the façade of the south portico, with its thirteen arches of which that in the middle constitutes a sort of triumphal arch crowned with a cupola, form an ensemble with "a powerful air of majesty", according to the French historian and sociologist Paul Sebag (1919–2004).