 Al @-@ Aziz Billah ( 955 – 996 ) is generally considered to have been the most extensive of Fatimid builders . Aided in part by funds generated through his father al @-@ Mu 'izz 's tax reforms , Al @-@ Aziz is credited with at least 13 major building works during this reign from 975 until his death , including the Golden Palace , the Cairo Mosque , a fortress , a belvedere , a bridge and public baths . His mother , <unk> , widow of al @-@ Mu 'izz , was also responsible for ordering the commencement of building projects , mainly in the Qarafa area , ordering construction of the second mosque in Cairo , Jami al @-@ Qarafa Mosque , in 975 . Similar to the first mosque , Al @-@ Azhar Mosque , it had some fourteen gates but was later destroyed by fire , leaving only its " green mihrab " . <unk> is also credited with ordering construction of the Qarafa Palace , a public bath , cistern , or pool , and a royal garden and hydraulic pump for the Abu ' l @-@ Ma <unk> fortress . She also ordered a well to be built in the courtyard of Ibn Tulun Mosque in 995 , a pavilion overlooking the Nile called Manazil al @-@ izz , and her own mausoleum in Qarafa . 
