[citation needed] His paternal grandfather, Sayyid Husayn Ridhwi, entered the Mughal Empire during the reign of Aurangzeb, who married him to the daughter of Mir Hadi (Sheikh Sulayman Fazail).

[3] Qasim was married to Fatima Begum, a daughter of Mir Jafar and Shah Khanum, and a granddaughter of Nawab Alivardi Khan of Bengal.

[6] Upon ascending the throne, Mir Qasim rewarded the East India Company with lavish gifts.He also granted it the right to collect revenue of the districts of Burdwan,Midnapore and Chittagong.

The relationship between Qasim and the company slowly deteriorated, and he shifted his capital from Murshidabad to Munger in present-day Bihar where he raised an army, financing his new troops by streamlining tax collection.

Having lost all his men and influence after his defeat at Buxar, Qasim was expelled from his camp by Shuja-ud-Daula on 23 October 1764; fleeing to Rohilkhand, Allahabad, Gohad and Jodhpur, and eventually settling at Kotwal, near Delhi ca.

[citation needed] Mir Qasim died in obscurity and abject poverty possibly from dropsy, at Kotwal, near Delhi on 8 May 1777.