In 1639, Rajmahal regained its glory and was once more made the capital of Bengal by Shah Shuja, the second son of Emperor Shahjahan, on his appointment as the Viceroy of Bengal. It continued as the seat of the Mughal Viceroy up to 1660 and a mint town till 1661. It was at Rajmahal that Dr. Gabriel Boughten cured the daughter of Shah Shuja. By this means Dr. Boughten succeeded in securing an order (farman) from Shah Shuja giving the English the liberty to trade in Bengal. Thus the minutest foundation of the British rule was laid here. The fugitive Nawab of Bengal Siraj-ud- Daula was captured at Rajmahal during his flight after the Battle of Plassey in 1757.