Note: Sources conflict on the period of dating the mosque - either during the reign of the third Fatimid caliph (per MIT) or of the sixth caliph, in another ("Hakem be-Amr Allah" entry, Encyclopædia Iranica Vol. 11, pp. 572-573, ed. Ehsan Yarshater. Encyclopædia Iranica Foundation & Eisenbrauns, Inc., New York, 2003). MIT is cited here, pending agreement of authoritative sources.