List of dukedoms in the peerages of Britain and Ireland
| Extant | All |
|---|---|
| Dukes | Dukedoms |
| Marquesses | Marquessates |
| Earls | Earldoms |
| Viscounts | Viscountcies |
| Barons | Baronies |
| Baronets | Baronetcies |
This page lists all dukedoms, extant, extinct, dormant, abeyant, or forfeit, in the peerages of England, Scotland, Great Britain, Ireland and the United Kingdom.
Edward III of England created the first three dukedoms of England (Cornwall, Lancaster, and Clarence). His eldest son Edward, the Black Prince, was created Duke of Cornwall, the first English Duke, in 1337. Two weeks after the Prince's death the dukedom was recreated for his 9-year-old son Richard of Bordeaux, who would eventually succeed his grandfather as Richard II. The Dukes of Cornwall are not numbered as part of their style.
The second dukedom was originally given to Henry of Grosmont, 1st Duke of Lancaster, but upon his death was re-created for the 3rd son of Edward III, John of Gaunt, 1st Duke of Lancaster. On that same day Edward III also created a dukedom for his second son, Lionel of Antwerp, 1st Duke of Clarence. When Richard II reached majority, he created dukedoms for his last two uncles on the same day: Edmund of Langley, 1st Duke of York, and .
Originally, dukedoms were created primarily for those who had royal blood, either by descent or marriage (see below, list of surnames). By the end of the Middle Ages, traditionally marked by the Battle of Bosworth Field on 22 August 1485, a total of 31 dukedoms (with 16 distinct titles) had been created; yet only those of Cornwall and Lancaster remained. The Duchy of Cornwall was permanently associated with the heir apparent, and the duchy of Lancaster became Crown property.
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