It is next to the south wall of the Kasbah Mosque.[86] It was lost for many years until the French rediscovered it in 1917 using aerial photographs.[87] The mausoleum comprises the remains of about sixty members of the Saadi Dynasty which originated in the valley of the Draa River.[9][28] Among the tombs are those of Saadian sultan Ahmad al-Mansur and his family; al-Mansur buried his mother in this dynastic necropolis in 1590 after enlarging the original square funeral structure constructed by Abdallah al-Ghalib.