Sholto Douglas, 15th Earl of Morton
Sholto Charles Douglas, 15th Earl of Morton (c. 1732–25 September 1774) was the son of James Douglas, 14th Earl of Morton.
He was Colonel of a regiment of light dragoons, the 17th Regiment of Light Dragoons, raised in Scotland in 1759 and disbanded in 1763.
In February 1754 he was elected a Fellow of the Royal Society
On 19 November 1758, he married Katherine Hamilton and they had two sons:
James Douglas, 14th Earl of Morton
James Douglas, 14th Earl of Morton, KT, PRS (1702 – 12 October 1768) was a Scottish astronomer and representative peer who was President of the Philosophical Society of Edinburgh from its foundation in 1737 until his death.
He also became President of the Royal Society (24 March 1764), and was a distinguished patron of science, and particularly of astronomy.
He was born in Edinburgh as the son of George Douglas, 13th Earl of Morton and his second wife Frances Adderley.
He graduated MA from King's College, Cambridge in 1722.
In 1746 he visited France, and was imprisoned in the Bastille, probably as a Jacobite.
He had a long lasting tendency to protest the actions of the British government.
William Herbert, 18th Earl of Pembroke
William Alexander Sidney Herbert, 18th Earl of Pembroke, 15th Earl of Montgomery( born 18 May 1978) is an English peer.
He became earl in 2003 following the death of his father, Henry Herbert, 17th Earl of Pembroke.
Robert Douglas, 8th Earl of Morton
Robert Douglas, Earl of Morton( died 12 November 1649) was a Scottish nobleman and Earl of Morton.
He was the son of William Douglas, 7th Earl of Morton and Lady Anne Keith, daughter of George Keith, 5th Earl Marischal.
In 1627, he married Anne Villiers, a daughter of Sir Edward Villiers.
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 Elizabeth Villiers.
He succeeded as the 9th Earl of Morton on 12 November 1649.
William tried to preserve the grant of the Islands of Orkney and Zetland which had been given to his grandfather, Sir William, 7th Earl of Morton.
The wadset (a loan masked as a sale of land under right of reversion) of the Lordship had been set aside, and annexed to the Commonwealth in 1657.
On the Restoration, he obtained a new grant, which confirmation was ratified by Parliament in 1661.
However, this too was pronounced null and void, and the islands were vested in the Crown by Act of Parliament on 27 December 1669.
Thenceforward the Earls of Morton held these islands under a form of mortgage from the Crown.
On 9 September 1672 he resigned the Barony of Dalkeith in favour of James, the Duke of Buccleuch.
The estate of Dalkeith and other lands, to the total value of £100,000 Scots yearly rental, had been sold circa 1643 to Buccleuch to enable the 7th Earl meet his expenses supporting the King.
William married Grizel, daughter of John, Earl of Middleton, in 1662.
Their only son, Charles, Lord Dalkeith, died in infancy in 1663.
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.
Archibald Douglas, 8th Earl of Angus
Archibald Douglas, 8th Earl of Angus and 5th Earl of Morton( 15554 August 1588) was the son of David, 7th Earl of Angus.
He succeeded to the title and estates in 1558, being brought up by his uncle, James Douglas, 4th Earl of Morton, a Presbyterian.
In 1573 he was made a Privy Councillor and Sheriff of Berwickshire; in 1574 Lieutenant- General in Scotland; in 1577 Warden of the West Marches and Steward of Fife; and in 1578 Lieutenant- General of the realm.
As a supporter of Morton and" ultra- Protestant" policy he was twice forced in exile in England.
John Boyle, 15th Earl of Cork
John Richard Boyle, 15th Earl of Cork and 15th Earl of Orrery( born 3 November 1945) is a British hereditary peer and a member of the House of Lords, where he sits as a Crossbencher.
Boyle was an officer in the Royal Navy before inheriting his titles in 2003.
John Douglas, 21st Earl of Morton
John Charles Sholto Douglas, 21st Earl of Morton( 19 March 1927 – 5 March 2016) was a Scottish peer and landowner.
Douglas was the son of Hon. Charles William Sholto Douglas and Florence Timson.
He was educated at Bryanston School and Canford School.
He succeeded to the earldom in 1976, upon the death of his first cousin, the 20th Earl.
Morton was a property consultant, a partner in Dalmahoy Farms and chairman of the Edinburgh Polo Club, and was a director in Scotland of the Bristol& West Building Society.
In 1982, he was appointed a deputy lieutenant of West Lothian, and he served as Lord Lieutenant of West Lothian from 1985 to 2002.
He married Mary Sheila Gibbs( 1927- 2016) in 1949, by whom he had three children:
James Douglas, 3rd Earl of Morton
James Douglas, 3rd Earl of Morton( died 1548) was a son of John Douglas, 2nd Earl of Morton and a grandson of James Douglas, 1st Earl of Morton and Joan of Scotland, a daughter of James I of Scotland.
He married Catherine Stewart, an illegitimate daughter of King James IV of Scotland by his mistress Marion Boyd.
The couple had three daughters; Margaret, Beatrix, and Elizabeth.
He was succeeded by his son-in- law, James Douglas, 4th Earl of Morton, husband of his daughter Elizabeth.
His daughter Lady Margaret Douglas married James Hamilton, 2nd Earl of Arran, who was heir presumptive to the Scottish throne after Mary, Queen of Scots prior to the birth of Queen Mary's son Prince James in 1566.
Beatrix married Robert Maxwell, 6th Lord Maxwell.
Morton's three daughters were all affected by mental ill- health.
Stewart Douglas, 22nd Earl of Morton
John Stewart Sholto Douglas, 22nd Earl of Morton( born 17 January 1952) is a Scottish peer and landowner.
Known as Stewart, Douglas is the son of John Douglas, 21st Earl of Morton and Mary Sheila Gibbs.
He succeeded to the earldom in 2016, upon the death of his father.
He married Amanda Kirsten Mitchell and has three children.

Question: What is the date of death of Sholto Douglas, 15Th Earl Of Morton's father?