Edward Mordake / Mordrake

Edward Mordake was the heir to a 19th century English peerage.  He had an extra face on the back of his head that looked to be like that of a parasitic twin.  Most reports say that the face didn't show any emotion, but did appear to cry at times when Edward was laughing, and would laugh at the times when Edward was crying.
Reports say that he committed suicide at the age of 23 because of the face on the back of his head.  He pleaded to several surgeons to remove the face off of the back of his head but none would remove it after the first surgeon who had agreed to the surgery had died of mysterious causes the day before the surgery was slated to take place.  Edward complained openly that when he was alone that the face would start to whisper to him in a strange language and he started to refer to it as his "demon face"
His family would place a gag in the face's mouth and have Edward wear ornate head wraps when going out to any official function, and in his last three years alive was not allowed out in public at all.