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
Peers wear their coronets at coronations. Otherwise, coronets are seen only in heraldic representations, atop a peer's arms. Coronets include a silver gilt chaplet and a base of ermine fur. The coronet varies with the rank of the peer. A member of the Royal Family uses a royal coronet instead of the coronet he or she would use as a peer or peeress.