Cornelius O'Callaghan, 2nd Baron Lismore (1775-1857), eldest son of Cornelius O'Callaghan, Baron Lismore (died 1797) and his first wife, Sarah, daughter of John Davis of Carrickfergus; married Eleanor (died 1859), (see lot 53) youngest daughter of John, 17th Earl of Ormonde and Ossory and sister of Walter, 1st Marquess of Ormonde (see lot 52), from whom he was divorced by an Act of Parliament in 1826. He was succeeded by his third and only surviving son, George Ponsonby, 2nd Viscount. The title became extinct after his death in 1898