Margaret Magennis, Viscountess Iveagh (died 1744) (1673–1744) Parents Helen MacCarty William Burke, 7th Earl of Clanricarde Children John Butler, 15th Earl of Ormonde Katherine Butler Richard Butler Walter Butler Mary Butler Helen Butler Honora Butler Margaret Butler Siblings Thomas Bourke Honora Burke William Bourke Ulick Burke, 1st Viscount Galway Richard Burke, 8th Earl of Clanricarde Thomas Bourke John Burke, 9th Earl of Clanricarde Partners Thomas Butler of Garryricken Brian of Iveagh, 5th Viscount of Mogennis