Sir George Keith was born in 1746. He passed away in 1823. 
He was twice married: in 1787 to Jane Mercer, daughter of Colonel William Mercer of Aldie; and in 1808 to Hester Thrale, daughter of Henry Thrale and Hester Thrale, who is spoken of as 'Queeney' in Boswell's Life of Johnson and Mme d'Arblay's Diary. He had a daughter by each marriage, the second being Georgina Augusta Henrietta Keith, but no son. Thus the viscounty became extinct on his death, but the British and Irish baronies descended to his elder daughter Margaret (1788–1867), who married the Comte de Flahault de la Billarderie, only for the baronies to become extinct on her death. 
↑ Published in The History of Parliament: the House of Commons 1790-1820, ed. R. Thorne, 1986, Available from Boydell and Brewer ELPHINSTONE, Sir George Keith (1746-1823), . Ref Volumes: 1790-1820
Author: D. G. Henry. Seen and entered July 23, 2017 by Susanna de Bruyn
↑GCB - Knight Grand Cross. Order of the Bath.From Wikipedia, the free encyclopedia . The Most Honourable Order of the Bath (formerly the Most Honourable Military Order of the Bath) is a British order of chivalry founded by George I on 18 May 1725. The name derives from the elaborate medieval ceremony for appointing a knight, which involved bathing (as a symbol of purification) as one of its elements. The knights so created were known as "Knights of the Bath".George I "erected the Knights of the Bath into a regular Military Order". He did not (as is commonly believed) revive the Order of the Bath, since it had never previously existed as an Order, in the sense of a body of knights who were governed by a set of statutes and whose numbers were replenished when vacancies occurred. Seen and entered July 23, 2017 by Susanna de Bruyn
I have linked his daughter Margaret Mercer Elphinstone, who is already mentioned in his biography. Hope it is fine.
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