Qasim Khan Mirza Mohammad, –
" Nawab " - He was known as "Shrafudullah Sohrab Jung" and "Wali-e-Hateen, Zellah Gurgaon". He was the 4th in generation of Khawja Abdul Rehman Yousuee. Qasim Khan imgrated from Bukhara to India with his brothers in 1770. The famous "Gali Qasimjan" in Delhi is named after him, and he also constructed the Masjid therein.
Qasim Jan Beg showed his commanding and diplomatic skills and soon became the courtier of Mir Muinul Mulk, (Governor of Lahore). They remained there in Lahore until the sudden death of Mir Muinul Mulk (Mir Mannu) on 4th November 1753 of an accidental fall from his horse.
After the death of Mir Moin ul Mulk, Mirza Qasim Beg and his contingent moved out from Lahore, when this caravan reached Attock, it was entertained by Mirza Muhammad Beg subedar of the region, who offered his daughter in marriage to the youngest brother Mirza Arif Jan Beg. They left for Delhi in late seventeen fifties, but Emperor was away in Bihar at that time. So Qasim Jan and his brothers, left for east.
Mir Qasim Nawab of Bengal and Bihar, finding that the Qasim Jan was a bold and resourceful leader, recommended him to Emperor Shah Alam. When Emperor Shah Alam got the knowledge of his ingenious bravery he admired Mirza Qasim Jan Beg and took him into his courtier ship and awarded him the title of “Sharaf-ud-Doula”. He fought in Moghul Army alongside Shah Alam against British the Battle of Buxar, fought on 22 October 1764 between the combined armies of Mir Qasim, the Nawab of Bengal; Shuja-ud-Daula the Nawab of Awadh; the Mughal Emperor Shah Alam II and the forces under the command of the British East India Company led by Hector Munro. The battle fought at Buxar, then within the territory of Bengal, a town located on the bank of the river Ganges, this battle was a decisive victory for the British East India Company.
Shah Alam first acts was to strengthen and raise a new Mughal Army, under the command of Zulfiqar-ud-Doulah Mirza Najaf Khan. The appointment of Mirza Najaf Khan was processed with the advice of Mirza Qasim Jan Beg. By then Mirza Qasim Jan became Naib Wazir to Emperor Shah Alam II and was given the title of Nawab, and also Granted the Jagir of Hateen in the Gurgaon district. Given the region and thereafter he built his home close to Red Fort, in Ballimaran, Delhi, in the lane that is still known as Gali Qasim Jan, and also built mosque nearby known as Qasim Khani Mosque. In Gali Qasim Jan; there is a Katra Alam Beg in Ahata Kaley Sahab, Ballimaran, Chandni Chowk Delhi, by the name of Mirza Alam Jan Beg. Mirza Qasim Jan Beg was given the title of Sharaf ud-Daula, Nawab Muhammad Qasim Khan Bahadur, Sohrab Jang. When Maratha garrison permanently occupied Delhi in 1788 and ruled on north India for next two decades, this turn of the events created disappointment for Nawab Qasim Jan Beg, after discussing and taking advice from Mirza Alam Jan and Arif Jan he decided to leave the courtship of the Emperor and went to Lucknow with his family. Once Mirza Qasim Beg was going to present his tribute to Dargah of a famous Sufi Saint Hzt. Qutubudd Bakhtiar Kaki, with his brother Mirza Arif Jan, they met with an accident and after few days they both died at Delhi, His grave and that of his brother, Mirza Arif Jan are on the way to the Dargah of Hzt. Qutubudd Bakhtiar Kaki at Mehrauli, Delhi and on the right of Mosque, which means their heads are towards the Masjid.