Robert Boileau Pemberton dating history

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Robert Boileau Pemberton (1798–1840) was a British army officer and, later, a political officer in British India. As a Lieutenant, he was sent as a junior commander of the British-funded Manipur Levy provided to prince Gambhir Singh of Manipur. He was instrumental in evicting the Burmese from Manipur during the First Anglo-Burmese War. Later, he was appointed as a commissioner for Manipur along with Captain Grant and the two negotiated the boundary with the Burmese commissioners. Pemberton demarcated the boundary between Manipur and the Kabaw Valley, which was ceded to Burma after the negotiations. It came to be known as the "Pemberton's Line". Pemberton was noted as a distinguished geographer. He surveyed the territory of Manipur and the surrounding country, and wrote a book titled Report on the Eastern Frontier of British India in 1835, which is a valuable early historical reference on the states of northeast India as well as Burma.