Margaret Plunkett Peerage person ID=500125 (b. 1581) Parents Frances Bagenal Oliver Plunkett, 4th Baron Louth Children Oliver FitzWilliam, 1st Earl of Tyrconnell William FitzWilliam, 3rd Viscount FitzWilliam Richard Fitzwilliam Siblings Matthew Plunkett, 5th Baron Louth Partners Thomas FitzWilliam, 1st Viscount FitzWilliam