Ang Snguon was the second son of Thommo Reachea III.
In 1749, Satha II was installed as the Cambodian king by the Vietnamese Nguyễn lords.
Ang Snguon drove the Vietnamese army out, and proclaimed himself the new king.
With the help of mediation by Mạc Thiên Tứ, Ang Snguon was allowed to come back to Cambodia.
As a condition, Tầm Bôn (尋奔, present day Tân An of Long An Province) and Lôi Lạt (雷巤, present day Gò Công of Tiền Giang Province) were ceded to the Nguyễn lords.