In 1462, the most ambitious of the Lords of the Isles, John MacDonald, struck an alliance with Edward IV of England to conquer Scotland. Civil war in England prevented this from taking effect and from being discovered until 1475, when the English court voluntarily revealed its existence. Calls for forfeiture of the Lordship naturally followed, but they were calmed when John quitclaimed most of his mainland territories. However, John's nephew launched a severe raid on Ross, but it ultimately failed. Within two years of the raid, in 1493, James IV of Scotland declared the Lordship of the Isles forfeit, transforming the realm into an intrinsic part of Scotland rather than a dependency.