 The <unk> is a characteristic type of Fatimid building , a shrine that commemorates a descendant of the Prophet Muhammad . The tombs of the Fatimid caliphs were also treated as shrines . Most of the <unk> were straightforward square structures with a dome , but a few of the mausoleums at Aswan were more complex and included side rooms . During the rule of al @-@ Hafiz ( r . 1130 – 1149 ) several mausoleums and mosques were rebuilt to honour notable female figures in Shi 'i history . The caliphs also built tombs for their wives and daughters . 
