 Singhanavati Kingdom subjugated Umongasela City, which was then ruled by the Khmer, and other nearby states to extend its territory.Sometimes it was defeated, for example in the reign of Pra-ong Pung the royal seat was removed to the nearby city of Paan-gum, a city on the Sai River (Chiang Rai's northernmost district), but it eventually restored its independence.The last king of Singhanavati Kingdom was named Phramahajaijana.