Abraham Lincoln ĭeath seems to have encountered Abraham Lincoln, the King of Mars. According to Kent Osborne, Death had met Peppermint Butler years ago when he started dabbling in the macabre and has been friends with him ever since. It was at the revelation that Finn and Jake knew Peppermint Butler that Death allowed them to return to the surface, even though Finn had lost a music battle to him.
Death appears to have a friendly relationship with Peppermint Butler as revealed in the episode 'Death in Bloom,' though it is unknown how long they have been acquainted with one another.