Raja Kishan Singh (28 April 1575 â May 1615) was the first Rathore Rajput ruler of Kishangarh and younger son of Mota Raja Udai Singh of Marwar Kingdom and the founder of Kishangarh and the eponymous Kishangarh State.
Born on 28 April 1575 as Kunwar Krishan Singh,he was one of the younger sons of Raja Udai Singh ruler of Marwar. His mother was Rajawatji (Kachwahiji) Manrang Deiji the tenth and the principal consort of his father and the daughter of Raja Askaran of Narwar, who was also briefly Raja of Amber before being ousted in favour of his uncle, Bharmal. He was also the younger full-brother of Sur Singh, ruler of Marwar and Mani Bai, wife of Jahangir and mother of Shah Jahan.
Kishan Singh was sent to Mughal service at a very young age. In 1594, he was confirmed by Akbar, the grant of a territory southeast-ward of Jodhpur.
In 1607, he was granted a mansab of 1000 Zat and 500 Sawar by Jahangir.
In 1608, he assisted Mahabat Khan against the Rana of Mewar and had been wounded on the leg by a spear. For his laudable service, Jahangir raised his rank to 2000 Zat and 1000 Sawar. He was also granted the jagir of Setholav.
In 1609, he founded the town of Kishangarh on the site of Setholav.
In 1612, he was granted the title of "Maharaja" by Jahangir. In March 1615, his mansab was raised to 3000 Zat and 1500 Sawar.
Kishan Singh died in May 1615 near Ajmer. The incident is described by Jahangir as follows:
He was succeeded by his son Sahas Mal.