Robert Sheffield Sheffield, Robert, marquess of Normanby (1711–1715), subject of a memorial effigy (1711–1715) Parents Catherine Sheffield, Duchess of Buckingham and Normanby John Sheffield, 1st Duke of Buckingham and Normanby Children Siblings Edmund Sheffield, 2nd Duke of Buckingham and Normanby John Sheffield, Marquess of Normanby Lady Catherine Annesley Sir Charles Sheffield, 1st Baronet Katharine Sophia Herbert Mary Sheffield Charlotte Herbert