The Qutub Minar complex houses many more monuments and places of interest than Qutub Minar. The tomb of Iltutmish is also part of the Qutub Minar Complex. Iltutmish is the second slave dynasty ruler of India after Qutub-ud-din-Aibak. Read more about this at http://india-travels.com/blog/2017/01/03/tomb-of-iltutmish/