Sarah Margetson (died 1733) (1689–1733) Parents Alice Caulfeild John Margetson Children Lady Letitia Ponsonby William Ponsonby, 2nd Earl of Bessborough Lady Anne Ponsonby John Ponsonby Alicia Colville Lady Sarah Ponsonby Siblings George Carpenter, 2nd Baron Carpenter Partners Hugh Colvill Brabazon Ponsonby, 1st Earl of Bessborough