William Trench, 3rd Earl of Clancarty Irish noble (1803-1872) (1803–1872) Parents Henrietta Margaret Staples Richard Trench, 2nd Earl of Clancarty Children Lady Sarah Le Poer Trench Frederick Le Poer Trench Richard Trench, 4th Earl of Clancarty William Le Poer Trench Lady Anne Le Poer Trench Power Henry Le Poer Trench Siblings Frederick Robert Le Poer Trench Harriet Kavanagh Lady Lucy Le Poer Trench Richard John Le Poer Trench Lady Frances Power Le Poer Trench unknown daughter Le Poer Trench Lady Louisa Augusta Anne Le Poer Trench Lady Emily Trench Partners Lady Sarah Butler