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).
Peerage of England
Baronets, while holders of hereditary titles, are not peers and do not confer nobility. Knights, Dames, and holders of other non-hereditary orders, decorations, and medals of the United Kingdom are also not peers.