He received official Mongol recognition as the ruler of Burma in March 1298 .
Nearly ten years after the fall of Pagan , Kyawswa decided to become a Mongol vassal in January 1297 .
Kyawswa received official Mongol recognition as the ruler of Burma in March 1298 .
Nearly ten years after the fall of Pagan , Kyawswa decided to become a Mongol vassal in January 1297 .