The Rise and Fall of Toungoo Empire

At 1527, by the fall of Burmese Ava (Inwa) kingdom at the hands of Mohnyin (shan state from the northern Myanmar), Shan domination seemed to be permanent.
However, Toungoo kingdom ( a broke-away burmese kingdom from Ava) become power center of Burmese people, not only countering Shan domination, but raised to be the most powerful empire of Southeast Asia at that time.
From 1551 to 1574, King Bayinnaung the Great of Toungoo (R 1551-1581) conquered over 2 dozens kingdoms ( Bago, Ava, Prome, Ayutthaya, Lanna, Martaban, Lan Xang, Sagaing, Mohnyin, Hsewi, Hsipaw, Kale, Manipur, Mong Mao, Kengtung, Mone, Annan, Yawnghwe, Momaik, Phitsanolauk, Mogaung, Chiang Hung)
At the peak of its power, Bayinnaung reigned over present day Myanmar (excluding Arakan), Thialand, Laos, Parts of Yunan and Manipur of India. It was also known as second Burmese empire.
After Bayinnaung, his son Nanda Bayin could not hold these lands together and Toungoo empire disintegrated into many kingdoms and states.

Another son of Bayinnaung, King Nyaungyan and grandson King Anaukphetlun reconqured its lost land and rebuilt Burmese empire excluding Siam in 1600s. Although it was the continuation of Bayinnaung bloodline and known as restored toungoo dynasty , however it was regarded as Nyaungyan Era (1599-1754) in Burmese history.

Origins of Toungoo: from walled village to mighty empire
http://books.google.co.uk/books?id=vmIVhKXwrFcC&lpg=PA123&ots=xoo63D29UF&dq=toungoo&pg=PA123#v=onepage&q&f=false