The Madrasa Rukniye, built for the Amir Rukn al-Din Mankuris, a governor of Egypt under his half-brother the Ayyubid Sultan al-Adil (one of Saladin’s sons). It has been given a new minaret, the madrasa includes a mosque, which was just having a service when I passed (I did not enter, but instead took pictures of the fine Kufic calligraphy outside).

On this picture the turba will be under the cupola to the left, the right one covering the mosque (in my opinion).