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Qutb-ud-din Aibak was the founder of the Slave dynasty. Shams-ud-din Iltutmish (reigned: 1211-1236) was one of the slaves of Qutb-ud-din Aibak who later became his Son-in-Law. Iltutmish succeeded to the throne after Qutub-ud-din-Aibak. He was one of the leading rulers of the Delhi Sultanate and played a key role in extending the empire to a large part of the country. He was a Turk, who belonged to the Ilbari tribe. Qutub-ud-din-Aibak, who was at that time the Viceroy of Delhi was impressed by his intelligence and bravery and purchased him. Gradually, he rose to a high position and was appointed as the Governer of Gwalior. Fascinated by his intelligence, goodness and nobleness of character Aibak married his daughter to him.