 In 1487 his eldest son, Robert Crichton, was created a peer with the title Lord Crichton of Sanquhar by James III of Scotland.Another descendant of Thomas de Crichton was Sir William Crichton who in 1439 was appointed to the office of Chancellor of Scotland, during the minority of James II of Scotland.Crichton organised the infamous "black dinner" at Edinburgh Castle of which he was constable.