Not far from the manor farm of Penhesgyn dwelt a dragon. One day a soothsayer prophecized that the heir to the manor would be killed by the dragon, so the lord of the manor sent the boy away to England.
In the meantime a local youth slew the dragon by putting a polished cauldron in the bottom of a pit. When the dragon saw its reflection it fought it until it was exhausted. At that point the youth killed the dragon and it was buried in the pit.
Thinking that all was well, the heir returned to the manor, but insisted on seeing the body of the dragon.
When the carcass was exhumed the heir made to kick the dragon's head but instead caught one of the dragon's poisonous fangs in his foot and died. Thus the prophecy was fulfilled.