Baron Lucas

The second creation is extant and is currently held with the title Lord Dingwall in the Peerage of Scotland.

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)).

In 1816 she was created Countess de Grey, of Wrest in the County of Bedford, in the Peerage of the United Kingdom, with a special remainder to her sister (the widow of the 2nd Baron Grantham) and her heirs male.

On his death, the Earldom of Cowper and its associated titles became extinct, the Barony of Butler became abeyant, and the Barony of Lucas and the Lordship of Dingwall passed to his nephew, Auberon Herbert (a grandson of the 3rd Earl of Carnarvon), who became 9th Baron Lucas and 5th Lord Dingwall.

After this, the succession was straightforward, the Barony and Lordship passing to the 9th Baron and 5th Lord's sister Nan Ino Herbert (later Cooper) (the 10th Baroness and 6th Lady), then her daughter (the 11th Baroness and 7th Lady), and then her son (the 12th Baron and 8th Lord), who is the current holder of the titles.