Shams ud-Din Iltutmish (; died 30 April 1236, ) was the third of the Mamluk kings who ruled the former Ghurid territories in northern India. He was the first Muslim sovereign to rule from Delhi, and is thus considered the effective founder of the Delhi Sultanate. Sold into slavery as a young boy, Iltutmish spent his early life in Bukhara and Ghazni under multiple masters. In the late 1190s, the Ghurid slave-commander Qutb ud-Din Aibak purchased him in Delhi, thus making him the slave of a slave. Iltutmish rose to prominence in Aibak's service, and was granted the important iqta' of Badaun. His military actions against the Khokhar rebels in 1205–1206 gained attention of the Ghurid ruler Muhammad of Ghor, who manumitted him even before his master Aibak was manumitted. After Muhammad of Ghor's assassination in 1206, Aibak became a practically independent ruler of the Ghurid territories in India, with his headquarters at Lahore. After Aibak's death, Iltutmish dethroned his unpopular successor Aram Shah in 1211, and set up his capital at Delhi. He then consolidated his rule by subjugating several dissidents, and fighting against other former Ghurid slaves, such as Taj al-Din Yildiz and Nasir ad-Din Qabacha. During 1225–1227, he subjugated Aibak's former subordinates who had carved out an independent kingdom headquartered at Lakhnauti in eastern India. He also asserted his authority over Ranthambore (1226) and Mandore (1227), whose Hindu chiefs had declared independence after Aibak's death. In the early 1220s, Iltutmish had largely stayed away from the Indus Valley region, which was embroiled in conflicts between Qabacha, the Khwarazmian dynasty, and the Mongols. In 1228, he invaded the Indus Valley region, defeated Qabacha, and annexed large parts of Punjab and Sindh to his empire. Subsequently, the Abbasid Caliph Al-Mustansir recognized his authority in India. Over the next few years, Iltutmish suppressed a rebellion in Bengal, captured Gwalior, raided the Paramara-controlled cities of Bhilsa and Ujjain in central India, and expelled Khwarazmian subordinates in the north-west. His officers also attacked and plundered the Chandela-controlled Kalinjar area. Iltutmish organized the administration of the Sultanate, laying the foundation for its dominance over northern India until the Mughal invasion. He introduced the silver tanka and the copper jital – the two basic coins of the Sultanate period, with a standard weight of 175 grains. He set up the Iqtadari system: division of empire into Iqtas, which were assigned to the nobles and