The Mausoleum of Iltutmish

Shams ud-Din Iltutmish also spelled Altamash was a slave but married the daughter of his master, Quṭb al-Dīn Aibak, whom he succeeded in 1211. He strengthened and expanded his empire in northern India and moved the capital to Delhi. He was the third of the Mamluk kings who ruled the former Ghurid territories in northern India. He was the first Muslim sovereign to rule Delhi and is thus considered the effective founder of the Delhi Sultanate. 

The Tomb of Shams ud-Din Iltutmish is situated just outside the northwest corner of the Quwwat-ul-Islam near the Qutub Minar in Delhi. It is said that it built by iltutmish himself in 1235 CE, only a year before his death. 

The tomb is square from the outside but the squinch arches inside give it an octagonal look which makes a magnificent circular roof. It has three entrances, on the north, south, and east elevations. Three beautifully carved mihrabs are placed as the central niche on the western wall.