"Later, under Jayavarman VII (1181–ca. 1218), Khmer reached its zenith of political power and cultural creativity. Jayavarman VII gained power and territory in a series of successful wars. Khmer conquests were almost unstoppable as they raided home cities of powerful seafaring Chams.... Following Jayavarman VII's death, Khmer experienced a gradual decline.... The Angkorian monarchy survived until 1431...."
In Cambodia, today's "History of" country.