Sophisticated civilization in El Salvador dates to its settlement by the Native American Lenca people; theirs was the first and the oldest indigenous civilization to settle in El Salvador. The Lenca were succeeded by the Olmecs, who eventually also disappeared, leaving posterity their monumental architecture in the form of pyramids still extant in western El Salvador. The Maya arrived and settled in place of the Olmecs, but their numbers were greatly diminished when the Ilopango supervolcano eruption caused a massive Mayan exodus out of what is now El Salvador