What is "tribhuvanaditya"

Tribhuvanāditya was the ruler of the Khmer Empire from 1166 to 1177. He came to power after he assassinated Yasovarman II. He ruled over many rebellions by Yasovarman's loyal supporters but managed to hold the throne until forces from the neighboring Champa empire under Jaya Indravarman III invaded and conquered his capital Angkor. He was then killed Jaya Indravarman III.