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).
Peerages in the United Kingdom
Baronets, while holders of hereditary titles, are not peers since baronetcies have never conferred noble status, although socially they came to be regarded as part of the aristocracy. Knights, Dames and holders of other British non-hereditary chivalric orders, decorations, and medals are likewise not peers.