Jamal al-Din al-Ustadar was an Emir of Nasir al-Din Faraj, the Mamluk sultan of Egypt. He was very influential in his time, including his work on some important building structures in Cairo. He is also a controversial figure, who was removed from his post and executed in 1411.
Read more about Jamal Al-Din Al-Ustadar: The Madrasa of Jamal Al-Din