1. Qutub Minar was built in Delhi on a Hindu religious site (maybe over a Vishnu Stambha).
2. It was built by Qutub-ud-din Aibak, a Sultan of Mamluk Dynasty.
3. Delhi Sultanate is not any dynasty. Many dynasties like the Mamluk Dynasty, Khilji Dynasty, Balban Dynasty, Tughlaq Dynasty and Lodhi Dynasty ruled during the period of 1192 to 1526.
Beware! I question everything and everybody.