Constance married three times, and each of her husbands in turn assumed the title of earl of Richmond jure uxeris, in conjunction with that of Duke of Brittany (also jure uxeris). They were: Geoffrey Plantagenet (1158–1186), son of Henry II of England; Ranulph de Blondeville, Earl of Chester (c. 1172–1232) ; and Guy de Thouars (d. 1213), who survived his wife for twelve years. The only son of the first marriage, Arthur (1187–1203), was styled Earl of Richmond in his mother's lifetime. On his likely murder at the hands of his uncle, King John (John Lackland [English] or Jean sans Terres [French]), the earldom's possession was disputed. Arthur's legal heir, his full elder sister, Eleanor, is sometimes considered to have succeeded him as Countess of Richmond, but due to her claims to England, Brittany, Anjou and Aquitaine, King John kept her imprisoned from 1202. To complicate matters, Constance of Brittany had two daughters by her third marriage, the elder of whom, Alix, was proclaimed Duchess of Brittany by the Breton lords and given in marriage to Peter Mauclerc by King Philip II of France, in 1213. Alix used the title Countess of Richmond from 1203 to her death in 1221. As a result of his marriage to Alix, Pierre was styled Duke of Brittany and Earl of Richmond, but the latter title was only officially proclaimed in 1218, during the reign of Henry III, while Eleanor was apparently deprived of her last title. Peter Mauclerc was the founder of the Breton House of Dreux. The title would continue in the House of Dreux for some time, although from time to time, it was forfeited, or it reverted to the crown. About 1235 Peter Mauclerc renounced his allegiance to England, and consequently suffered forfeiture of his English estates. The title was however not restored to Eleanor, who was kept imprisoned till her death in 1241. In 1241 Henry III granted the estates of Richmond to Peter of Savoy (1203–1268), uncle of his queen consort, Eleanor of Provence. Peter was thereafter described as Earl of Richmond by contemporary chroniclers. By his will, Savoy left Richmond to his niece, Eleanor, who transferred it to the crown. That year, 1268, Henry III granted the earldom to John I, Duke of Brittany (1217–1286), son of Pierre Mauclerc. The title was recreated for John I's heir, John II, Duke of Brittany. In 1306 the title was