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Hsinbyushin (Burmese: ဆင်ဖြူရှင်, IPA: [sʰɪ̀ɰ̃ pʰjú ʃɪ̀ɰ̃], lit. 'Lord of the white elephant'; Thai: พระเจ้ามังระ; 12 September 1736 – 10 June 1776) was the third emperor of the Konbaung dynasty of Burma (Myanmar) from 1763 to 1776. The second son of the dynasty founder Alaungpaya is best known for his wars with Qing China and Siam, and is considered the most militaristic king of the dynasty. His successful defense against four Qing invasions preserved Burmese sovereignty. His 1765 invasion of Ayutthaya brought an end to the Ayutthaya Kingdom. The near simultaneous victories over Qing and Siam has been referred to as testimony "to a truly astonishing elan unmatched since Bayinnaung." He also raised the Shwedagon Pagoda to its current height in April 1775.
The deputy commander-in-chief during his father's reunification campaigns (1752–1759), Hsinbyushin as king pursued an expansionist policy against his neighbors. By 1767, his armies had put down a rebellion in Manipur, captured the Laotian states, sacked and destroyed Ayutthaya, and driven back two invasions by China. However, his reckless decision to wage two simultaneous wars against China and Siam nearly cost the kingdom its independence. The third Chinese invasion forced Hsinbyushin to hastily withdraw from Siam, until an uneasy truce in 1769.