Wikipedia
Mahendravarman (; also titled Citrasena) was a king of the kingdom of Chenla, modern day Cambodia, during the 6th century. Chenla was the direct predecessor of the Khmer empire. Citrasena was a close relative of Bhavavarman I, whom he joined to conquer the Kingdom of Funan, and whom he succeeded as king and adopting the name Mahendravarman. After Bhavavarman's death, Mahendravarman took residence in the capital at Sambor Prei Kuk while the same time Hiranyavarman was ruling Cambodia.
Mahendravarman sent an ambassador to Champa to "ensure friendship between the two countries."
After the death of Mahendravarman, his son Isanavarman had taken the control of the kingdom, where his father ruled for several years. He ruled the kingdom until 628.