Mary Fitzwilliam Peerage person ID=59261 (b. 1560) Parents Jane Preston Sir Richard Fitzwilliam Children Thomas Plunkett Jane Plunkett Patrick Plunkett Frances Plunkett Oliver Plunkett, 6th Baron Louth Margaret Plunkett Ignatius Plunkett Hon. Elizabeth Plunkett Catherine Plunkett Siblings Thomas FitzWilliam, 1st Viscount FitzWilliam Catharine Fitzwilliam Partners Matthew Plunkett, 5th Baron Louth Gerald Aylmer