 Jayavarman IV ruled from 928 to 941 at Koh Ker.He was a believed to have been the local king at this remote site, possibly his homeland, before he became king of the whole empire.That could explain why he had his residence at Koh Ker and not at Roluos (Hariharalaya) or at Yashodharapura (Angkor) like the kings before him.