With the Catholic Monarchs, there began a policy of reintegration of the royal patrimony that gave rise to a long fight with the principality, lasting from 1483 to 1490, with the signing of an agreement by which the House of Quiñones handed over to the Crown the districts of Cangas, Tineo, Llanes, and Ribadesella in exchange for five million maravedis and the Leonese Babias. In 1496 there was an attempt to revive the principality by Royal Letter dated 20May, in which the monarchs, "wishing to observe the ancient custom" of their Kingdomsan allusion to Aragongave to Prince John the rents and jurisdictions of the Asturian places that had previously reverted to the Crown, reserving to them the majority of the judges and the condition of not alienating his patrimony.