Definition #1 for "four horsemen of the apocalypse"
Julio (Rudolph Valentino) is a the favorite grandson of a rich landowner in Argentina, but his decision to start a new life Paris as World War I begins places him on the opposite side of the battlefield...
Definition #2 for "four horsemen of the apocalypse"
The Four Horsemen of the Apocalypse are characters in the Christian bible who bring about the end times. Online, they are parodied in image macros which show four people or characters who are jokingly labeled the Four Horsemen of the Apocalypse.