English Royalty. Duke of Bretagne (Brittany). Son of Eleanor of Aquitaine and Henry II. In 1166 Henry signed a contract with Conan IV de Bretagne in which Conan gave Henry the Bretagne and named Geoffrey his heir and promised to administrate the duchy. To strengthen the contact Geoffrey was engaged to the daughter of Conan, Constance de Bretagne. As Duke of Bretagne he was like his older brothers Henry, (Duke of Anjou), and Richard, (Duke of Aquitaine), liegeman of the King of France. Henry withheld the power from them and with each passing year they became more frustrated. The three brothers rebelled against the father with the help of King Philippe II Auguste, their mother and brothers-in-law Henri I de Champagne and Thibaut V de Blois. The brothers were defeated and signed a peace contract with their father. Geoffrey later again allied with the King of France and was named Senechal of France. He died during a tournament in Paris trampled to death by his horse. His half-sister Marie de Champagne and his sister-in-law, Marguerite de France, attended the funeral and established an annual revenue at Notre-Dame in his memory.