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Nawabs of Awadh

The fort was coveted by the East India Company for the same reasons Akbar built it. British troops were first stationed at Allahabad fort in 1765 as part of the Treaty of Allahabad signed by Lord Robert Clive, Mughal emperor Shah Alam II, and Awadh's Nawab Shuja-ud-Daula. The combined forces of Bengal's Nawab Mir Qasim, Shuja and Shah Alam were defeated by the English at Buxar in October 1764 and at Kora in May 1765. Alam, who was abandoned by Shuja after the defeats, surrendered to the English and was lodged at the fort, as they captured Allahabad, Benares and Chunar in his name. The territories of Allahabad and Kora were given to the emperor after the treaty was signed in 1765.

Shah Alam spent six years in the Allahabad fort and after the takeover of Delhi by the Marathas, left for his capital in 1771 under their protection. He was escorted by Mahadaji Shinde and left Allahabad in May 1771 and in January 1772 reached Delhi. Upon realising the Maratha intent of territorial encroachment, however, Shah Alam ordered his general Najaf Khan to drive them out. Tukoji Rao Holkar and Visaji Krushna Biniwale in return attacked Delhi and defeated his forces in 1772. The Marathas were granted an imperial sanad for Kora and Allahabad. They turned their attention to Oudh to gain these two territories. Shuja was however, unwilling to give them up and made appeals to the English and the Marathas did not fare well at the Battle of Ramghat. In August and September 1773, Warren Hastings met Shuja and concluded a treaty, under which Kora and Allahabad were ceded to the Nawab for a payment of 50 lakh rupees.

Saadat Ali Khan II, after being made the Nawab by John Shore, entered into a treaty with the company and gave the fort to the British in 1798. Lord Wellesley after threatening to annex the entire Awadh, concluded a treaty with Saadat on abolishing the independent Awadhi army, imposing a larger subsidiary force and annexing Rohilkhand, Gorakhpur and the Doab in 1801.