Thray Sithu of Myinsaing

During the Ava succession crisis of 1425–1426, he supported his cousin King Min Nyo (r. 1425–1426), and commanded a depleted royal army against the forces of Governor Thado of Mohnyin.

[1] The prince apparently was held in high regard by King Swa who appointed his grandson to be governor of Myinsaing, the ancestral home of Pinya–Sagaing–Ava dynasties,[2][3] c. 1386.

Like senior princes of the day, he (and his brother) started out in the royal army, as regimental commanders, and saw action in the third campaign (1390–1391) of the war.

[7][8][9] Furious, King Minkhaung, despite his advisers' strenuous objections, launched an invasion of the southern country in May 1408 right before the rainy season.

When the invasion predictably got bogged down in the Irrawaddy delta three months into the campaign, the king sent a delegation led by Thray Sithu to negotiate a ceasefire.

Thray Sithu did not remain in Arakan; the Ava fort was commanded by Letya of Phaunglin for the next three years.

[13][14] Despite the preparations, Thissein fell quickly after a daring surprise attack from the river side by Thado's sons.

Then the enlarged forces of Mohnyin attacked Wetchet, where Thray Sithu and his deputy Sokkate were waiting with 3000 troops.

Prince Thray Sithu was descended from the Ava–Pinya–Myinsaing royal lines, and ultimately the Pagan royalty from both sides.