Located in the Malakpur Kohli village near Vasant Kunj in Delhi, Sultan Ghari (Sultan of the Cave) is the tomb of Prince Nasiruddin Mahmud, eldest son of Slave Sultan Iltutmish and brother of Razia Sultan. During the reign of Iltutmish, Nasiruddin Mahmud was in charge of Awadh and Bengal where Hasmuddin Iwaz Khilji was trying to establish an independent Sultanate.
Though Nasiruddin Mahmud suppressed the rebellion of Hasmuddin Iwaz Khilji and killed him, he himself died in 1229. Iltutmish founded the Nasiriyya college of Delhi in memory of his son. The celebrated contemporary historian Minhaj-us-Siraj was appointed to the principalship of the college.
Iltutmish also built a mausoleum for Nasiruddin Mahmud. Built in 1231-32, the cenotaph is in an underground chamber. Hence the name Sultan Ghari (Sultan of the Cave).
The roof of the mausoleum is an octagonal platform. The materials were taken from Hindu monuments.