It is well known that Henry VI of England suffered from mental illness, widely believed to be inherited from his French grandfather, Charles VI. But was this really the case? His mother Queen Catherine had several children by Owen Tudor after the death of his father Henry V. Were any of the Tudor children similarly affected? I don't know much about them, but I do recall that Jasper Tudor lived on into the reign of Henry VII, an apparently healthy man. Could Henry VI had been sick for another reason or perhaps it was just a coincidence?