Cornelius O'Callaghan, 1st Baron Lismore Irish politician (1741–1797) Parents Thomas O'Callaghan Sarah Davis Children Elizabeth O'Callaghan Cornelius O'Callaghan, 1st Viscount Lismore Louisa Cavendish Robert O'Callaghan Mary O'Callaghan George O'Callaghan Siblings Elizabeth O'Callaghan Partners Frances Ponsonby