In 1704, Murshid Quli Khan, the Diwan of Bengal under Aurangzeb transferred the capital from Dacca (now Dhaka in Bangladesh) and renamed the city Murshidabad after his own name. In 1716, he attained the title of Nawab (ruler) of the Subah (province) of Bengal, and Murshidabad became his capital.

Murshidabad was a town and district of British India, in the Bengal Presidency. In the Mughal period, it was the capital of Bengal. The town of Murshidabad is on the left bank of the Hooghly River or main channel of the Ganges.

 

Source: Wikipedia