Bayinnaung Kyawhtin Nawrahta was king of the Toungoo Dynasty of Myanmar from 1550 to 1581. During his 31-year reign, which has been called the "greatest explosion of human energy ever seen in Burma", Bayinnaung assembled what was probably the largest empire in the history of Southeast Asia, which included much of modern-day Myanmar, the Chinese Shan states, Lan Na, Lan Xang, Manipur and Siam.