The Treaty of Poona was signed on 13 June 1817 between the East India Company and the Peshwa (ruler) of Pune, Baji Rao II. The treaty resulted in the British gaining control of the territory north of the Narmada River and south of the Tungabhadra River. Baji Rao also had to give up any claim to Gaikwad. Finally, "he was not to communicate, in any manner, with any other power in India."
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Text from the Wikipedia article “Treaty of Poona”, available under CC BY-SA 4.0.