El Salvador has over twenty volcanoes; two of them, San Miguel and Izalco, have been active in recent years. From the early 19th century to the mid-1950s, Izalco erupted with a regularity that earned it the name "Lighthouse of the Pacific". Its brilliant flares were clearly visible for great distances at sea, and at night its glowing lava turned it into a brilliant luminous cone. The most recent destructive volcanic eruption took place on 1 October 2005, when the Santa Ana Volcano spewed a cloud of ash, hot mud and rocks that fell on nearby villages and caused two deaths. The most severe volcanic eruption in this area occurred in the 5th century AD when the Ilopango volcano erupted with a VEI strength of 6, producing widespread pyroclastic flows and devastating Mayan cities.