The eldest son of the founder of the kingdom Saw Yun (r. 1315−27) was placed on the throne by Chief Minister Nanda Pakyan who ran the country.
[2] Because Kyaswa, the eldest son, was not yet four years old, his half-uncle Tarabya I succeeded the throne, marrying Saw Hnaung as his chief queen.
In 1339, Shwetaungtet, having discovered their whereabouts, came to Mindon with an expeditionary force, and brought them back to Sagaing.
[5] Kyaswa took the reign name of Thiri Tri Bhawanaditya Pawara Dhamma Yaza at his accession.
[5] His first act as king was to reappoint Nanda Pakyan as the Chief Minister and Commander-in-Chief with the title of Thubarit.
Kyaswa left an inscription in 1343/44 at the Thamanda Pagoda (on the route between Mindon and Sagaing) where he and his two queens donated land and a monastery.