List of dukedoms in the peerages of Britain and Ireland

Columns: Dukedom | Date of creation | Grantee | Surname | Current status | Notes
Cornwall | 9 February 1337 | Edward of Woodstock | Plantagenet ( originally ) | Extant | Held by the eldest living son of the monarch who is also heir-apparent to the throne ; title currently held by Charles , Prince of Wales . Also includes the Duchy of Cornwall | Lancaster | 6 March 1351 | Henry of Grosmont | Plantagenet | Extinct 13 March 1361 | Clarence | 13 November 1362 | Lionel of Antwerp | Plantagenet | Extinct 17 October 1368 | Lancaster | 13 November 1362 | John of Gaunt | Plantagenet | Merged in crown 30 September 1399 | The Sovereign is occasionally styled as Duke of Lancaster , regardless of gender . See also Duchy of Lancaster | Cornwall | 20 November 1376 | Richard of Bordeaux | Plantagenet | Merged in crown 22 June 1377 | Distinct from the 1337 creation , as the holder was not the eldest son of the monarch | York | 6 August 1385 | Edmund of Langley | Plantagenet | Merged in crown 4 March 1461 | Forfeit 1415-1425 ; November 1459-7 October 1460 | Gloucester | 6 August 1385 | Thomas of Woodstock | Plantagenet | Forfeit 8 September 1397

Example questions:
Who was the Dukedom of the grantee in the peerages of Britain and Ireland who was born January 7 , 1355 ? | What is the date of creation of the Dukedom in the peerages of Britain and Ireland that is a title that has been created six times ? | What is the surname of the Grantee in the peerages of Britain and Ireland who was slain at the Battle of Agincourt ?

Answers:
Gloucester | 16 May 1414 | Plantagenet