sentences:  At its peak, the First Toungoo Empire also included Manipur, Chinese Shan States, Siam and Lan Xang.But the largest empire in the history of Southeast Asia collapsed in the 18 years following Bayinnaung's death in 1581.The dynasty quickly regrouped under the leadership of Nyaungyan Min and his son, Anaukpetlun, who succeeded in restoring a smaller, more manageable kingdom, encompassing Lower Burma, Upper Burma, Shan States and Lan Na by 1622.