List of dukedoms in the peerages of Britain and Ireland

Columns: Dukedom | Date of creation | Grantee | Surname | Current status | Notes
Lancaster | 10 November 1399 | Henry of Monmouth | Plantagenet | Merged in crown 20 March 1413 | Also Duke of Cornwall | Clarence | 2 July 1412 | Thomas of Lancaster | Plantagenet | Extinct 22 March 1421 | Bedford | 16 May 1414 | John of Lancaster | Plantagenet | Extinct 14 September 1435 | Gloucester | 16 May 1414 | Humphrey of Lancaster | Plantagenet | Extinct 28 February 1447 | Exeter | 18 November 1416 | Thomas | Beaufort ( Plantagenet ) | Extinct 30 December 1426 | Son of John of Gaunt , grandson of Edward III | Exeter | 6 January 1443 | John | Holland | Forfeit 4 November 1461 | Descendant of Edmund of Woodstock , earl of Kent , son of Edward I

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