The title of Lord Oliphant was, after the death of Francis, assumed by William Oliphant of Langton, descended from Peter Oliphant, the third son of Laurence the fourth Lord Oliphant. William voted as Lord Oliphant at the election of Representative Peers without protest on 15 March 1750. However, since the second creation was "heirs male of the body" of Patrick Oliphant of Newtyle, that title had become extinct on the death of the 5th Lord (second creation.) Therefore, in peerage law, sitting at the Election of Peers and voting as Lord Oliphant was de facto a third creation of the peerage. William died without issue in 1751 and although William had a nephew senior to him in line, the Langton line became extinct in 1852.