granted to his son John of Brittany who entered into the service of Edward I and Edward II of England. As an earl, John of Brittany was particularly inattentive to English politics. He had a distinguished record as a diplomat working on behalf of these Kings of England and was a frequent warrior in their military quests, both on the continent and in Britain. Upon John of Brittany's death, the title passed to his nephew, John III, Duke of Brittany. The earldom was then passed to Jean de Montfort, John III's half-brother. John III had no issue and upon his death the inheritance of the Duchy of Brittany became disputed. John III's niece, Joanna of Penthievre claimed the Duchy without apparently claiming to be hereditary Countess of Richmond. John III's half-brother, Jean de Montfort, the Earl of Richmond disputed Joanna's claim to the Duchy and their dispute was initially adjudicated by the French King in a court of peers in Conflans, France. In that adjudication, Charles of Blois, Joanna's husband, gained recognition as Duke of Brittany and Jean de Montfort fled. The Breton War of Succession ensued. The French king's adjudication raised the question of whether the Duke of Brittany and separately the Earl of Richmond, whether one and the same or not, owed homage to the French king as vassal. Jean de Montfort fled Conflans in order to regain his troops who occupied many fortified castles in a line from Nantes to Brittany. The French King raised an army to defend the interests of Charles of Blois and seized the county of Montfort from Jean de Montfort. The king then proposed to Jean de Montfort that he would permit him to retain the Earldom of Richmond if Jean accepted the adjudication of Conflans and returned to the French court as a loyal vassal. Edward III reacted by supporting Jean de Montfort. In 1342, the title reverted to Edward III and would remain for a time behind the "shield of England" as the competing claims of the French and English crowns were played out, first in the Breton War of Succession and then across the Hundred Years' War. Edward III granted the Earldom to his son John of Gaunt, who then surrendered it in 1372. The earldom was then given to John V, Duke of Brittany, but on his death or possibly at an earlier date through forfeiture, it reverted