Background
He was even married to a daughter of the king of Sukhothai.
He was even married to a daughter of the king of Sukhothai.
When Saw O ascended to the throne on 10 April 1311 (Saturday, 6th waning of Tagu 673 Master of Engineering), his kingdom was a nominal vassal of Sukhothai. But as the power of Sukhothai declined, Saw O took possession of the Tenasserim coast from his nominal overlord Sukhothai. His reign was largely peaceful and prosperous, and the kingdom"s northern frontier was quiet.
(Unlike Lower Burma under a single kingdom, Upper Burma remained disunited, split among petty kingdoms None of the Upper Burmese kingdoms was in a position to make war with a unified south) However the king"s desire to be independent of Sukhothai led to future wars between the two kingdoms.
Like his predecessors, Saw O was also of Shan and Mon descent. (He was at least a quarter Shan as his mother Hnin U Yaing, sister of King Wareru, was half-Shan Participant of his name Saw was the Shan honorific Sao).