This empire fought repeated wars against the Annamese and the Chams, finally falling to the Thais in 1434, after which its capital was transferred from the stone temples of the Angkor region to Phnom Penh.  
In the 9th century, it was united by Jayavarman II, and Sanskrit literature flourished under the enlightened court of him and his successors, who tolerated both Buddhism and Siva worship.  This empire fought repeated wars against the Annamese and the Chams, finally falling to the Thais in 1434, after which its capital was transferred from the stone temples of the Angkor region to Phnom Penh.  FTP name this ancient Cambodian empire, which later lent its name to an infamous political party.
In the 9th century, it was united by Jayavarman II, and Sanskrit literature flourished under the enlightened court of him and his successors, who tolerated both Buddhism and Siva worship.  
the Khmer empire