A premature attempt to amalgamate the duchy of Brittany with the French crown failed.
In Brittany the chief seat of oyster production is the gulf of Morbihan, where the estuaries of numerous small rivers furnish fore-shores suitable to the industry.
Hermann makes St Ursula a native of Brittany, and so approximates to the version of the story given by Geoffrey of Monmouth (Historia Britonum), according to whom Maximian, after fleeing from Rome and acquiring Britain by marriage, proceeds to conquer Brittany and settle it with men from the island opposite.
Ralph forfeited his English lands, and took refuge in Brittany on his wife's estate.
Thus the definitive reunion of Brittany and France was prepared.
John renounced his suzerainty over Brittany and the guardianship of his nephew, Arthur; he engaged not to aid the count of Flanders or Otto IV.
He entered the army of Henry IV., and served in Brittany under Jean d'Aumont, Francois de St Luc and Charles de Brissac. When the army of the League was disbanded he accompanied his uncle, who had charge of the ships in which the Spanish allies were conveyed home, and on reaching Cadiz secured (1599) the command of one of the vessels about to make an expedition to the West Indies.
He died at Croisic in Brittany on the 25th of August 1908.
Charles, the king's brother, was given Normandy as an apanage, thus joining the territories of the rebellious duke of Brittany with those of Charles the Bold.
At one time the duke of Brittany was nearly induced to surrender him to Edward IV.; but he remained safe in the duchy till the cruelties of Richard III.