Duke of Leinster

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.

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Earls of Kildare from 1316

This branch of the Welsh-Norman FitzGerald dynasty, which came to Ireland in 1169, were initially created Earls of Kildare. The earldom was created in 1316 for John FitzGerald. Two senior FitzGeralds, Garret Mór FitzGerald and his son, Garret Óg FitzGerald served as Lords Deputy of Ireland (the representative of the Lord of Ireland (the King of England) in Ireland). The tenth Earl, Thomas FitzGerald, known as Silken Thomas, was attainted and his honours were forfeit in 1537. In 1554, Thomas's half-brother and only male heir, Gerald FitzGerald, was created Earl of Kildare in the Peerage of Ireland. He was subsequently restored to the original Patent in 1569, as 11th earl. The second (1554-created) earldom became extinct in 1599, although the original earldom survived.

Dukes of Leinster from 1766