Geoffrey II

Geoffrey II., Duke of Brittany, third son of Henry II. of England and Eleanor of Guienne. He married Constance, daughter of Conan, Duke of Brittany, and with Henry II.'s aid usurped his father-in-law's throne. He was killed at the age of 28 in a tournament at Paris (1186), and left the ill starred Prince Arthur, who was put to death by j King John.