The peerage of Ireland consists of those titles of nobility created by the English monarchs in their capacity as Lord or King of Ireland, or later by monarchs of the United Kingdom of Great Britain an
Duke of Leinster is a title that has been created twice in the Peerage of Ireland since 1691. It does not include any territorial landholdings and does not produce any revenue for the title-holder.
Peerage of Ireland
…1801–present Dukes in the Peerage of Ireland Shield Title Creation Other Dukedom or higher titles House of Lords titles Monarch Kingdom of Ireland The Duke of Leinster 26 November 1766 Viscount Leinster 1747–1999 King George III Baron Kildare 1870–1999 United Kingdom of Great Britain and Ireland The Duke of Abercorn…