 He was appointed as governor or Muang Dan Sai, in the present day Loei Province of Thailand, and became remembered in Lao history as the hero of the Đại Việt invasion.In 1478, Đại Việt forces invaded Lan Xang, destroying the army organized by Chakkaphat Phaen Phaeo and led by Souvanna Banlang’s older brother Prince Kone Keo.The Lan Xang forces which included 200,000 men and 2,000 elephants were routed with the majority of Lao commanders being killed, including Prince Kone Keo who drowned while fleeing the Battle of the Plain of Jars.