The Qutb Minar is part of the broader Qutb Complex, which includes the Quwwat-ul-Islam Mosque, reputed to be the first mosque built in India. Construction on the Qutb Minar and Quwwat-ul-Islam Mosque began in 1193 by Qutb-ud-din Aibak, the founder of the Mamluk (Slave) Dynasty, the first Muslim dynasty to establish an empire in India. Aibak was a general under Mohammad Ghori, the Turkic-Afghan ruler who on several occasions swept downwards into India to plunder and defeated the Hindu ruler Prithviraj Chauhan, whose dynasty had previously ruled Delhi. The Qutb Minar is the tallest brick minaret in the world at 239 feet, and its five stories were successively built by Aibak, his successor Iltutmish, and finally by Feroz Shah Tughluq in 1368; the architectural styles of the different layers of the minaret reflect the evolution of the Indo-Islamic architectural style over the centuries, and have incorporated stones and tilework from the Hindu and Jain temples on the ruins of which the complex was erected. A highlight of the complex is the Alai Darwaza, the southern gateway to the complex; the Alai Darwaza, commissioned by Ala-ud-din Khilji (the first Khilji sultan of Delhi) and built by Turkish artisans beginning in 1311, is a magnificent sight even today despite its deterioration. Ala-ud-Din Khilji also began construction of the Alai Minar, which was intended to surpass the Qutb Minar in its height but construction of which was aborted upon Khilji&'s death; nonetheless, the one story of the minaret that was built remains an imposing sight. The Qutb Minar is a UNESCO World Heritage site.