Badakazi Amar Singh Thapa was the son of Bhim Singh Thapa who was killed in the war at Palanchowk. Amar Singh Thapa was given the 'marwat', which customarily awarded the post and salary of his father.Prime Minister Bhimsen Thapa's father was also called Amar Singh Thapa. Amar Singh Thapa played a major role in the conquest of Basie and chaubise Rajyas. He extended the western border of Nepal up to Sutlaj river.
During the Anglo-Nepal war Amar Singh Thapa was in-charge of the western border of Nepal. On the order hand, Sir David Ochterlony was-in-charge from the British side. A year before the war, the sons of Amar Singh Thapa and Sir David Ochterlony had struck a friendly(miteri) relation. As conditions got worse, Nepal was forced to sign the Sugauli treaty. The grief turned Amar Singh Thapa into an ascetic. He went to Gosainkunda where he died.
