William Douglas, 9th Earl of Morton

https://en.wikipedia.org/wiki/William_Douglas,_9th_Earl_of_Morton

William Douglas, Earl of Morton (died before 1 November 1681) was a Scottish nobleman and Earl of Morton.

He was the son of Robert Douglas, 8th Earl of Morton, and Anne Villiers. He succeeded as the 9th Earl of Morton on 12 November 1649.

William married Lady Grizel Middleton, daughter of John Middleton, 1st Earl of Middleton, in 1662. Their only son, Charles, Lord Dalkeith, died in infancy in 1663.[3] William died in 1681 leaving no heir, passing the Earldom to his uncle, James Douglas, 10th Earl of Morton, who was the son of William Douglas, 7th Earl of Morton and Lady Anne Keith.

http://www.thepeerage.com/p2596.htm#i25954

He married, secondly, Marjory Foulis.2

He succeeded as the 9th Earl of Morton [S., 1458] on 12 November 1649.1 He was appointed Privy Counsellor (P.C.) [Scotland] in 1660/61.1 In 1662 he obtained a fresh grant of the Orkney and Shetland Islands.1 On 27 December 1669 his grants of the Orkney and Shetland Islands were declared invalid.1 On 9 September 1672 he resigned any right he possessed to the Lordship of Dalkeith in favour of James, Duke of Buccleuch and Monmouth.1

https://fionamsinclair.co.uk/genealogy/Grantsfamilies/Earldom.htm

William, seventh Earl of Morton, died in Orkney on 7th August 1648, and was succeeded by his son, Robert, eighth Earl, who did not long survive his father, dying on 12th November 1649. He was succeeded by his son William, ninth Earl, from whom the wadset of the Lordship was set aside, and annexed to the Commonwealth in 1657. On the Restoration he was again confirmed in his title, which confirmation was ratified by Parliament in 1661. He died without issue in 1681, when the estates fell to his uncle Sir James Douglas of Smithfield, who became tenth Earl of Morton, and died in 1686, succeeded by his son James, eleventh Earl, who obtained, in 1707, a ratification of the Lordship and Earldom from Parliament, and died unmarried in 1715, when the succession opened to his brother Robert.

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References

1. https://en.wikipedia.org/wiki/William_Douglas,_9th_Earl_of_Morton
2. Maxwell, Herbert Eustace (1902). A history of the house of Douglas from the earliest times down to the legislative union of England and Scotland. Allen County Public Library Genealogy Center. London, Freemantle. Page 184 (called 10th Earl) < Archive.Org >
3. The Diary of Samuel Pepys. Daily entries from the 17th century London diary. < link > We also know that Lady Grizel Middleton married William Douglas, 9th Earl of Morton on 12 June, 1662 and their only son, Charles, died in infancy in 1663. Grizel died at some point, as William remarried to a Marjory Foulis. From this Pepys note, it sounds as if Grizel may still be alive in 1669. William died without leaving an heir in 1681.
4. http://www.thepeerage.com/p2596.htm#i25954 cites
   1. [S37] BP2003 volume 2, page 2787. See link for full details for this source. Hereinafter cited as. [S37]
   2. [S2] Peter W. Hammond, editor, The Complete Peerage or a History of the House of Lords and All its Members From the Earliest Times, Volume XIV: Addenda & Corrigenda (Stroud, Gloucestershire, U.K.: Sutton Publishing, 1998), page 120. Hereinafter cited as The Complete Peerage, Volume XIV.