John Sheffield, Marquess of Normanby (1710-1710) (1710–1710) Parents John Sheffield, 1st Duke of Buckingham and Normanby Catherine Sheffield, Duchess of Buckingham and Normanby Children Siblings Sir Charles Sheffield, 1st Baronet Katharine Sophia Herbert Mary Sheffield Edmund Sheffield, 2nd Duke of Buckingham and Normanby Robert Sheffield Charlotte Herbert Lady Catherine Annesley