The concept of equality in Islam and Muslim traditions reached its climax in the history of South Asia when slaves were raised to the status of Sultan. The Slave Dynasty ruled the Sub-continent for about 84 years. It was the first Muslim dynasty that ruled India. Qutub-ud-din Aibak , a slave of Muhammad Ghori, who became the ruler after the death of his master, founded the Slave Dynasty. He was a great builder who built the majestic 238 feet high stone tower known as Qutub Minar in Delhi. The next important king of the Slave dynasty was Shams-ud-din Iltutmush , who himself was a slave of Qutub-ud-din Aibak. Iltutmush ruled for around 26 years from 1211 to 1236 and was responsible for setting the Sultanate of Delhi on strong footings. Razia Begum , the capable daughter of Iltutmush, was the first and the only Muslim lady who ever adorned the throne of Delhi. She fought valiantly, but was defeated and killed. Finally, the youngest son of Iltutmush, Nasir-ud-din Mahmud became Sultan in 1245. Though Mahmud ruled India for around 20 years, but throughout his tenure the main power remained in the hands of Balban , his Prime Minister. On death of Mahmud, Balban directly took over the throne and ruled Delhi. During his rule from 1266 to 1287, Balban consolidated the administrative set up of the empire and completed the work started by Iltutmush.