Iltutumish was from the Illabari tribe of the Turks. He was the son–in–law of Aibak and succeeded him as the next Sultan of Delhi.
He is credited with building the Hauz-i- Shamshi near Mahrauli in Delhi. He also completed the work on Qutub Minaar which was started by his predecessor.
He also introduced the Iqta system in Delhi sultanate which was a practice of tax farming. Under Iqta system, an officer was given grant of revenue from a territory in lieu of salary. However, Iqta system wasnot hereditary. The Iqta system connected the farthest part of the Sultanate to the central government.
He is credited with issuing Silver Tanka and Copper Jital. The silver tanka had the weight of 175 grains.
During the reign of Iltutmish, the Mongols had attacked India under Chengez Khan. But they soon left India and moved towards Multan, Sind and Qabacha.