5) JOHN OF GAUNT
Another historical personage, English noble John of Gaunt, the first Duke of Lancaster, appears in Shakespeare’s ‘Richard II.’ John Gaunt, Grimjack, is a mercenary and bounty hunter in the interdimensional city of Cynosure, which fades in and out of other dimensions, seemingly at random. John of Gaunt dies in the play, as does John Gaunt in the comics, but only one of them finds himself reincarnated centuries later as another mercenary named Jim Twilley, whose life he tries to reject as false.
If you guessed that happened in the comics, you’re paying attention, and you get a gold star.