Thadominbya establishes the Upper Burmese kingdom of Ava in 1364 following the collapse of the Sagaing and Pinya Kingdoms due to raids by the Shan States to the north.

Ava, viewing itself as the rightful successor to the Pagan Kingdom, tries in its first years of existence to reassemble the former empire by waging constant wars against the Mon Hanthawaddy Kingdom in the south, the Shan States in the north and east, and Rakhine State in the west.

Thadominbaya dies childless of smallpox at twenty-one in 1368; his widowed queen and her soldier-bridegroom seize power, but opposition government ministers instead support the thirty-seven-year-old Swasawke, who soon evicts the usurping couple, ascends Ava’s throne as king, and settles the border war with Pegu in 1371.