In 1718, the Duke of Kent's elder son, Anthony, Earl of Harold (1695–1723), was summoned to Parliament by a writ in acceleration as Baron Lucas, and is usually numbered as the 3rd Baron (see note below). In view of the death of both his sons and the consequent extinction of the dukedom at his death the Duke managed to obtain in 1740 (at the cost of his other Grey titles excluding Lucas) only a new marquessate, Marquess Grey. However he obtained a special remainder of the marquessate, in default of his heirs male, to his granddaughter, Jemima Campbell (who was the only surviving child of his eldest daughter, the former Lady Amabel Grey, who was the late wife of Lord Glenorchy (later 3rd Earl of Breadalbane and Holland)). On the Duke's death later that year, the Barony of Lucas, along with the Marquessate of Grey, passed to this granddaughter (by now the wife of the 2nd Earl of Hardwicke), who became 2nd Marchioness Grey and 4th Baroness Lucas of Crudwell.