High Quality Content by WIKIPEDIA articles! Khan-e Jehan Nawab Qaim Khan Shaheed who was the son of Raja Motay Rai Chauhan, the ruler of Dorayra or Dadrewa (presently situated in the Bikaner district of Rajasthan). The first progenitor of Qaimkhanis was Karamchand born in the family of Moterao of Chauhan clan, the ruler of Dadrewa. Firuz Shah Tughluq converted him to Islam and named him Qaimkhan. Thus his descendants were called Qaimkhani. He embraced Islam along with his brothers, Nawab Zainuddin Khan and Nawab Jabaruddin Khan, in the times of Sultan Feroz Shah (born in 1310 CE and crowned in 1351 CE). Descendants of Nawab Zainuddin Khan and Nawab Jabaruddin Khan are also 'Qaim Khanis'. Nawab Qaim Khan was an Ameer of the Delhi Sultanate. Tuzk-e-Mehboobia of Sultan-e-Deccan Mir Mehboob Ali Khan mentions: "Nawab Qaim Khan embraced Islam in 754 Hijra. In 760 Hijra, Sultan Feroz Shah appointed him the Governor of Hisar Ferozah with the title of Khan-e-Jehan".