Sultan al-Mu'ayyad Mosque was built in the 15th Century, though the interior has seen significant change and renovations.  The mosque was built by order of Sultan al-Muayyad Shaykh (sultan from 1412 to 1421).   His tomb, and the tomb of his son, are just beyond the entrance to the mosque.

 The mosque was originally part of a larger madrasa and has a particularly spacious and beautiful sahn (courtyard).  The other interesting feature is that the mosque is built into the Bab Zuwayla (the southern gates of the old Fatimid city wall) and the minarets are actually part of the gate towers.