The peerage died out when George Keith, the 10th earl, forfeited it by joining the Jacobite Rising of 1715.
In his youth George Keith was made Lord Keith, by Queen Anne, and appointed Captain of her Majestys Guards.
George Keith, the 10th and last of the Earls Marischal succeeded in 1712 to the remains of a once magnificent inheritance, diminished of much of its territory through the troubles of the times, and by gifts conferred on younger branches of the house. Instigated by his mother, lady Mary Drummond, who was a Roman Catholic, he involved himself in the unhappy Rebellion, and the family estates were forfeited. The net yearly rental in 1718 was £2,384 and the whole lands were sold two years after to the York Buildings Company for £41,172. After many years' residence abroad, he was pardoned in 1760, and relieved as far as possible, by Act of Parliament, from the consequences of his attainder.
After the death of William Keith, 4th Earl of Kintore, George succeeded to the Kintore estates in 1761, and would have inherited the title as well, had he not refused to allow a clause to that effect to be inserted in the Act. Subsequently he purchased part of the family estates, intending to reside in Scotland. But the King of Prussia, in whose favor he had long stood high, was urgent for his return to that country. He complied, and died at Potsdam, leaving behind him a most excellent reputation. Exiled to Europe, George and his brother James achieved fame and esteem among the courts of Spain, France, Russia and Germany. Representing Frederick the Great of Germany, he returned on a visit to England, was reprieved for supporting the Stuarts, and had some of his family properties restored to him, including Dunnottar Castle.
George was unmarried and died childless in 1778. After his death it was decided that the titles and the estates should pass to the heir general of the 4th Earl of Kintore, grandson of a 2nd cousin of George: Antony Adriaan Keith-Falconer, grandson of Katharine Margaret Keith, the sister of the 4th Earl of Kintore. The chiefship of Clan Keith then also passed to Antony Adriaan Keith-Falconer.
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