He was commonly known as Mir Qasim, and he was the son-in-law of Mir Jaffer Ali Khan, the Nawab of Bengal. The English brought him to the throne in 1760. He tried to throw off the yoke of the British but was defeated in 1763 and the deposed Nawab Jafar Ali Khan was again brought to power. Mir Qasim fled from Monghyr to Patna and had fifty English men executed by his German General Samru. But in November 1763 Patna was captured by the British troops and Mir Qasim fled to Oudh. In 1764, in the famous battle of Buxer Mir Qasim was defeated along with his allies by the British and he had to escape. He died in exile.