John of Gloucester

John of Gloucester, also known as John Plantagenet, was an illegitimate son of King Richard III of England. John is so-called because his father was the Duke of Gloucester at the time of his birth. His father appointed him Captain of Calais, a position he lost after his father's death. He seems to have been held in custody at some point during the reign of Henry VII and may have been executed around 1499.