There are no explicit incarnations of the Four Horsemen of the Apocalypse in Planescape, although there are of course numerous powers of war, plague, famine, pestilence, and death.
War: Hextor, Ares, Morrigan, Hachiman
Plague, famine, pestilence: Incabulos
Death: Nerull, Kelemvor, Arawn, Hades, Izanami
You get the picture.
The Four Horsemen also appear in the book d20 Apocalypse as daemonic warriors.
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