| Dukedom of Ireland | |
| Creation Date: | 1386 |
| Creation: | First |
| Peerage: | Peerage of England |
| First Holder: | Robert de Vere |
| Subsidiary Titles: | Marquess of Dublin Earl of Oxford |
Duke of Ireland is a title that was created in 1386 for Robert de Vere, 9th Earl of Oxford (1362–1392), the favourite of King Richard II of England, who had previously been created Marquess of Dublin. Both were peerages for one life only. At this time, only the Pale of Ireland (the Lordship of Ireland) was under English control. Despite its name, the Dukedom of Ireland is generally considered to have been one in the Peerage of England, and is the first time that a Ducal title was created for someone who was not a close relative of the King.
The arms with three crowns that were granted to Duke Robert as an augmentation to his arms in 1386 continued to be used for nearly a century as the arms of the Lordship of Ireland.[1]
The Duke fell from favour shortly after receiving the title, resulted in forfeiture of the first creation in 1388.