Nanda Bayin (Burmese: နန္ဒဘုရင်, pronounced: [nàɴda̰ bəjɪ̀ɴ]; 9 November 1535 – 30 November [O.S. 20 November] 1600), was king of Toungoo Dynasty of Burma (Myanmar) from 1581 to 1599. He presided over the collapse of Toungoo Empire, the largest empire in the history of Southeast Asia.The eldest son of King Bayinnaung was one of the principal commanders in his father's military campaigns that expanded and defended the empire.