Question: the english east india company acquired the dewani of bengal bihar and orissa by
Answer: The Treaty of Allahabad was signed on 12 August 1765 , between the Mughal Emperor Shah Alam II , son of the late Emperor Alamgir II , and Robert , Lord Clive , of the East India Company , as a result of the Battle of Buxar of 22 October 1764 .