Edward Mordrake was reportedly the 19th century heir to an English peerage. He had an extra face on the back of his head, which could neither eat nor speak, although it could laugh or cry.
Edward begged doctors to have his "demon head" removed, because, supposedly, it whispered horrible things to him at night, but no doctor would attempt it.
He committed suicide at the age of 23.
You may think this is just a creepypasta. It is true.
Source: Edward Mordrake