In the book of Revelations, Armageddon is presaged by the four horsemen of the apocalypse. They are not specifically named but by description they would seem to be War, Conquest, Famine, and Death. Each is given power over a quarter of the Earth to destroy the human race. Armageddon (the Mountain of Megiddo) is presumably where the great battle between the Angels of both God and Satan will battle.