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).
List of earls in the peerages of Britain and Ireland
This is a list of the 193 present and extant earls in the Peerages of the England, Scotland, Great Britain, Ireland, and the United Kingdom. Note that it does not include extant earldoms which have become merged (either through marriage or elevation) with marquessates or dukedoms and are today only seen as subsidiary titles. For a more complete list, which adds these "hidden" earldoms as well as extinct, dormant, abeyant, and forfeit ones, see List of earldoms.