Reigns of Kyaswa and Uzana He first entered the royal service of King
Htilominlo and became a judge before graduating to the royal court as a junior minister. He rose to the rank of chief minister with the title of Yazathingyan by 1248 at King Kyaswa's court. By then the court ran the country. King Kyaswa, a devout Buddhist and scholar, was interested only in religion and gave up all administrative duties to his heir-apparent
Uzana. But Uzana was not interested in governing either; he was reportedly interested only in chasing elephants and drinking liquor. Uzana in turn handed over the administration to the court. When Kyawswa died and Uzana became king in 1251, nothing changed from the court's perspective. They still ran the country. However, the court, in particular Yazathingyan, came into conflict with Uzana's headstrong son and heir-presumptive
Thihathu. Yazathingyan felt slighted by what he considered the young prince's rude and disrespectful behavior toward him—someone several decades older. (According to the chronicles, Yazathingyan was once spat on by the young prince. but the powerful court disagreed. Yazathingyan persuaded the court to back Uzana's only other son by a concubine. The junior prince, known by the nickname of Min Khway-Chi (lit. "Prince Dog Dung"), was seen as harmless, and someone that they could control. and, though the chronicles do not explicitly state it, he was most likely executed.
Martaban campaign (1258–59) The king had acted in haste; the vassal rulers did not respect the inexperienced king. The vassal rulers of
Martaban (Mottama) and Missagiri both revolted. On the advice of his queen
Saw Hla Wun, the king recalled Yazathingyan to
Pagan (Bagan). In 1258, he returned to Pagan and organized two expeditions. In December 1258, Yazathingyan led an army of 2000 men, 200 horses, and 20 elephants to start the Martaban campaign, while Thray Pyissapate, captain of the Household Guards, led another army to Missagiri. Yazathingyan's army faced little resistance and took the city after a siege of 8 days. The minister appointed Aleimma as the new governor and brought back the rebellious governor Nga Shwe and prisoners of war.
Missagiri (1259–60) Meanwhile, the Missagiri campaign had gone badly. The army had been badly defeated there and retreated in disarray. The king sent Yanda Pyissi, the younger son of Yazathingyan, to the front with an order to execute the commander, Thray Pyissapate. Yazathingyan was on his way back to Pagan, intercepted his son en route near
Salin, and stopped him from carrying out the order. At Pagan, he presented the king with the rebel lord of Martaban and prisoners of war. When the king was in a better mood, he persuaded the king to rescind the execution order of Pyissapate. In return, the king asked Yazathingyan to lead the next dry-season campaign to Missagiri. Yazathingyan agreed. In November 1259, Yazathingyan led an army of 40,000 men to Missagiri. His two sons also joined him. The Pagan armies laid siege to the city until starvation forced them to surrender. Yazathingyan however fell ill on the return trip through the
Irrawaddy delta. He was either travelling by sea from Missagiri or settling some delta revolt. He died in Dala. He was 61. The king is said to have been greatly saddened by the news. ==Legacy==