Following in the footsteps of his cousin the King of Loungprabang, the Prince Nokasat Song, refused to acknowledge the rule of Setthathirath II.
A grandson of King Suliyavongsa, the prince had left Vientiane for Southern Laos upon the return of Setthathirath II.
Returning to Champassak, Prince Nyô saw a rebellion taking place and barely escaped out of the city.
They took their name from the city of Champassak, prefixed by the nobiliary particle na signifying of a former kingdom or tributary state of Siam.
At the time they were the national symbol and rallying point of the Laotian right centered around Prince Boun Oum na Champassak.