James FitzGerald, 1st Duke of Leinster
LieutenantGeneral James FitzGerald, 1st Duke of Leinster, etc. PC , styled Lord Offaly until 1744 and known as The Earl of Kildare between 1744 and 1761 and as The Marquess of Kildare between 1761 and 1766, was an Irish nobleman, soldier and politician.
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Source: Wikipedia