Jawhar As-Siqilli was commander-in-chief of Al-Mu’izz Li-Din Allâh, first Caliph of the Fatimid dynasty. He conquered Egypt and founded the city of Cairo; then, he began the construction of the Al Azhar Mosque. The work started in the month of Jumâdâ Al-Awwal of the year 359 A.H. (970 C.E.) and completed in the month of