Edward Mordake...

Edward Mordake (variously Mordrake) is the apocryphal subject 
of an urban legend who was, according to the legend, born in the 19th 
century, heir to an English peerage, and had an extra face on the back 
of his head.
The duplicate face could not see, eat or speak out loud but was said to 
"sneer while Mordake was happy" and "smile while Mordake was weeping". Mordake repeatedly begged doctors to have his "demon face" removed, claiming that it whispered things that "one would only speak about 
in hell" at night, but no doctor would attempt it. 
According to the legend, Mordake committed suicide at the age of 23.
History In Pictures
The Story Of Edward Mordrake, “The Man With Two Faces”

The photo — actually of a wax construction of what Edward Mordrake 
might have looked like — that set the Internet abuzz.
In 1895, The Boston Post published an article titled 
“The Wonders of Modern Science” that presented astonished readers 
with reports from the Royal Scientific Society documenting the existence 
of “marvels and monsters” 
hitherto believed imaginary.
The “human freaks” supposedly cataloged by the British scientists include 
a mermaid, a terrifying “human crab,” and the unfortunate Edward Mordrake, who would soon become an enduring urban legend.
As The Post reported, Edward Mordrake [or Mordake as he was originally called] was a young, intelligent, and good-looking English nobleman who had everything one could ask for from life. With all these great blessings, however, came a terrible curse. In addition to his handsome, normal face, Mordake possessed a terrifying disfigurement: another face on the back of his head.
This horrifying second face was that of a beautiful young girl. Despite the loveliness of the strange visage, there was no doubt it possessed an intelligence of its own “of a malignant sort.”
Edward Mordrake was constantly plagued by his “devil twin,” which kept him 
up all night whispering “such things as they only speak of in hell.” The young lord was eventually driven mad and took his own life at the age of just twenty-three, leaving behind a note ordering the evil face be destroyed after his death, “lest it continues its dreadful whispering in my grave.”

Drawing of Edward Mordrake and his “devil twin.”
The Boston Post
[...] https://allthatsinteresting.com/edward-mordrake
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https://en.wikipedia.org/wiki/Edward_Mordake