Built over the tomb of Sidi Yaqut al-Arshi which is still venerated by both men and women many of whom come to pray, or sit in comtemplation. The saint was a pupil of Abu'l Abbas al-Mursi whose tomb lies next door in the mosque of the same name.
source: http://girlsoloinarabia.typepad.com/photos/egypt/mosque_sidi_yaqutal_arshi.html