Dukes in the United Kingdom
Duke, in the United Kingdom, is the highest-ranking hereditary title in all four peerages of the British Isles. A duke thus outranks all other holders of titles of nobility (marquess, earl, viscount and baron).
Earl of Warwick
Earl of Warwick is one of the most prestigious titles in the peerages of the United Kingdom. The title has been created four times in English history, and the name refers to Warwick Castle and the town of Warwick.