Duke of Leinster
Royal title
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Duke of Leinster is a title in the Peerage of Ireland and the premier dukedom in that peerage. The subsidiary titles of the Duke of Leinster are: Marquess of Kildare, Earl of Kildare, Earl of Offaly, ... Wikipedia
Creation date: 26 November 1766
First holder: James FitzGerald, 1st Marquess of Kildare
Former seat(s): Maynooth Castle; Kilkea Castle; Leinster House; Carton House
Heir presumptive: Edward FitzGerald; (nephew of the present holder)
Peerage: Peerage of Ireland
Present holder: Maurice FitzGerald, 9th Duke