Emperor Shah Alam II gave the diwani of Bengal-Bihar and Orissa to East India Company on 12 August Soon after the Battle of Buxar, Shah Alam II, a sovereign who had just been defeated by the British, sought their protection by signing the Treaty of Allahabad in the year Shah Alam II was forced to grant the Diwani (right to collect revenue) of Bengal (which included Bihar and Odisha) to the British East India Company in return for an annual tribute of 2.6 million rupees to be paid by the company from the collected revenue. Tax exempt status was also restored to the company. The company further secured for the districts of Kora and Allahabad which allowed the British East India Company to collect tax from more than 20 million people. East India company thus became the Imperial tax collector in the former Mughal province of Bengal (which included Bihar and Odisha). East India company appointed a deputy Nawab Muhammad Reza Khan to collect revenue on behalf of the company.