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 Marshal
In the general order of precedence, the Earl Marshal is currently the highest hereditary position in the United Kingdom outside the Royal Family. Although other state and ecclesiastical officers rank above in precedence, they are not hereditary. The exception is the office of Lord Great Chamberlain, which is notionally higher than Earl Marshal and also hereditary, but as it is currently held by a marquess (Marquess of Cholmondeley), is consequently lower in the general order of precedence. The holding of the Earl Marshalship secures the Duke of Norfolk's traditional position as the "first peer" of the land, above all other dukes.