The year after Poitiers, Edward returned to England. In 1360 he negotiated the treaty of Bretigny. He was created Prince of Aquitaine and Gascony in 1362, but his suzerainty was not recognised by the lord of Albret or other Gascon nobles. He was directed by his father to forbid the marauding raids of the English and Gascon free companies in 1364. He entered into an agreement with Don Pedro of Castile and Charles II of Navarre, by which Pedro covenanted to mortgage Castro de Urdiales and the province of Biscay to him as security for a loan; in 1366 a passage was secured through Navarre. In 1367 he received a letter of defiance from Henry of Trastámara, Don Pedro's half-brother and rival. The same year, after an obstinate conflict, he defeated Henry at the Battle of Nájera. However, after a wait of several months, during which he failed to obtain either the province of Biscay or liquidation of the debt from Don Pedro, he returned to Aquitaine. Prince Edward persuaded the estates of Aquitaine to allow him a hearth tax of ten sous for five years in 1368, thereby alienating the lord of Albret and other nobles.