Edward Mordake was the name given to an apocryphal 19th century heir to an unspecified English peerage who was said to have suffered from a form of Diprosopus. According to sources, he had an extra face on the back of his head, which could neither eat nor speak out loudly, although it was described as being able to laugh and cry. Edward reportedly begged doctors to have his "demon face" removed, claiming that it whispered to him at night, but no doctor would attempt it. He committed suicide when he was merely 23 years old.
The story has been disputed in the past and was likely enriched with fictional elements. The description of Edward Mordake's condition is somewhat similar to those of Chang Tzu Ping and Pasqual Pinon. Both Mordake and Pinon are featured as the "2 Very Special Cases" on a list of "10 People With Extra Limbs or Digits" in 1976 edition of The Book of Lists.
This is the story as told in Anomalies and Curiosities of Medicine:
The following well-known story of Edward Mordake, though taken from lay sources, is of sufficient notoriety and interest to be mentioned here: —
"One of the weirdest as well as most melancholy stories of human deformity is that of Edward Mordake, said to have been heir to one of the noblest peerages in England. He never claimed the title, however, and committed suicide in his twenty-third year. He lived in complete seclusion, refusing the visits even of the members of his own family. He was a young man of fine attainments, a profound scholar, and a musician of rare ability. His figure was remarkable for its grace, and his face — that is to say, his natural face — was that of an Antinous. But upon the back of his head was another face, that of a beautiful girl, 'lovely as a dream, hideous as a devil'. The female face was a mere mask, 'occupying only a small portion of the posterior part of the skull, yet exhibiting every sign of intelligence, of a malignant sort, however'. It would be been seen to smile and sneer while Mordake was weeping. The eyes would follow the movements of the spectator, and the lips 'would gibber without ceasing'. No voice was audible, but Mordake avers that he was kept from his rest at night by the hateful whispers of his 'devil twin', as he called it, 'which never sleeps, but talks to me forever of such things as they only speak of in Hell. No imagination can conceive the dreadful temptations it sets before me. For some unforgiven wickedness of my forefathers I am knit to this fiend — for a fiend it surely is. I beg and beseech you to crush it out of human semblance, even if I die for it.' Such were the words of the hapless Mordake to Manvers and Treadwell, his physicians. In spite of careful watching, he managed to procure poison, whereof he died, leaving a letter requesting that the 'demon face' might be destroyed before his burial, 'lest it continues its dreadful whisperings in my grave.' At his own request he was interred in a waste place, without stone or legend to mark his grave."
In popular culture
A US thriller film named Edward Mordrake that is based on the story is scheduled for a 24 October 2014 release. 
- Anomalies and Curiosities of Medicine, pp. 188-189. George M. Gould, Walter L. Pyle. Kessinger Publishing. ISBN 978-0-7661-3211-5 (2003)
- The Story of Edward Mordrake, fact or fiction?
- TV clip on alleged surgical removal of Chang Tzu Ping's second face
- The People's almanac presents the book of lists, p. 314. David Wallechinsky, Irving Wallace, Amy Wallace. Morrow. ISBN 978-0-688-03183-1 (1977)
- "EDWARD MORDAKE – "Poor Edward"".
- Hoskyns, Barney (2009), Lowside of the Road: A Life of Tom Waits, Random House, p. 405, ISBN 978-0-7679-2709-3
- Edward Mordake at the Internet Movie Database
- "Edward Mordake – ‘Poor Edward’". J. Tithonus Pednaud. Retrieved 2008-11-11.