Cornelius O'Callaghan, 1st Viscount Lismore politician (1775-1857) (1775–1857) Parents Frances Ponsonby Cornelius O'Callaghan, 1st Baron Lismore Children William Frederick O'Callaghan Cornelius O'Callaghan George O'Callaghan, 2nd Viscount Lismore Lady Anne Maria Louisa O'Callaghan Siblings Elizabeth O'Callaghan Louisa Cavendish Robert O'Callaghan Mary O'Callaghan George O'Callaghan Partners Lady Eleanor Butler