The "Four Horsemen of the Apocalypse" is a term used to describe four horsemen that appear in the New Testament of the Christian Bible in chapter six of the Book of Revelation, which describes an apocalyptic vision. Although scholars disagree as to what exactly each horseman represents, the four horsemen are often referred to as Conquest, War, Famine, and Death. Summoned and empowered by God as part of the opening of the seven seals, the horsemen contribute to the widespread destruction that takes place in Revelation as part of the end of the world.
The white horse of the apocalyptic four may represent polar qualities of evil or righteousness, depending on interpretation. The German-language Lutheran Stuttgarter Erklärungsbibel sees him as civil war and internal strife. The other three horsemen represent evil, destructive forces, and given the unified way in which all four are introduced and described, it may be most likely that the first horseman is correspondingly evil.
Some interpret the rider of the white horse to be the Antichrist, or a representation of false prophets, citing differences between the white horse in Revelation 6 and Jesus on the white Horse in Revelation 19. Revelation 19 Jesus has many crowns, but in Revelation 6 the rider has one. In Revelation 19, the rider on the horse is depicted as "The Word of God".
The rider of the white horse may represent the second coming of Christ during which the end of the world/judgment day would occur. He may also just represent judgment of the living and the damned.
Religion, War, Famine and Death in Reformation Europe. By Andrew Cunningham and Ole Peter Grell (inspired by Albrecht Durer's image); currently on the White Horse.