Loyal vassal of Binnya U Sam Lek proved an able and loyal vassal. In the following years, he kept the northern Martaban province in Binnya U's realm, while Byattaba continued to rule the southern province. His job was made easier by the truce reached between the king and the two rebel brothers—Byattaba and Laukpya—soon after the battle of Donwun. The rebel brothers agreed to acknowledge U as their overlord in exchange for U's recognition of their de facto independent rule. Sam Lek proved a rare loyal vassal even when U gradually withdrew from governing the kingdom due to deteriorating health in later years. When U's eldest son
Binnya Nwe revolted in 1383, Sam Lek remained firmly in the ailing king's camp. He refused to submit when Nwe, 16, ascended the throne with the title of Razadarit in 1384.
Rebellion against Razadarit Sam Lek's insurrection was one of the three main rebellions against Razadarit; the other two were by Byattaba and Laukpya. But the viceroys did not form a united front against the new king. Razadarit, who controlled only the Pegu province (modern
Yangon Region and southern
Bago Region), could not take any action, as he was trying to survive invasions by the northern
Ava Kingdom in 1385–1387. For his part, Sam Lek did not consider himself a rebel. To him, Razadarit, who was not the chosen heir of Binnya U, was the true rebel and not a rightful successor. Even when Razadarit, facing an imminent invasion, in desperation asked Sam Lek to send troops in 1385, Sam Lek could not bear to send help. On the other hand, unlike Laukpya who invited Ava to invade the country, Sam Lek never aided Ava, nor did he join forces with Laukpya or Byattaba. ==Fall from power and death==