Duke of Leinster is a title in the Peerage of Ireland and the premier dukedom in that peerage. The title refers to Leinster, but unlike the province the title is pronounced "Lin-ster". The subsidiary titles of the Duke of Leinster are: Marquess of Kildare (1761), Earl of Kildare (1316), Earl of Offaly (1761), Viscount Leinster, of Taplow in the County of Buckingham (1747), Baron Offaly (1620) and Baron Kildare, of Kildare in the County of Kildare (1870). The viscounty of Leinster is in the Peerage of Great Britain, the barony of Kildare in the Peerage of the United Kingdom, and all other titles in the Peerage of Ireland. The courtesy title of the eldest son and heir of the Duke of Leinster is Marquess of Kildare.
Read more about Duke Of Leinster: Earls of Kildare From 1316, Dukes of Leinster From 1766, Dukes of Leinster, First Creation (1691), Earls of Kildare (1316), Marquesses of Kildare (1761), Dukes of Leinster, Second Creation (1766), Line of Succession, Coat of Arms, Further Reading