|Earldom of Rosslyn|
|Creation date||21 April 1801|
|Created by||King George III|
|Peerage||Peerage of the United Kingdom|
|First holder||Alexander Wedderburn, 1st Baron Loughborough|
|Present holder||Peter St Clair-Erskine, 7th Earl of Rosslyn|
|Heir apparent||Jamie St Clair-Erskine, Lord Loughborough|
|Remainder to||The 1st Earl's heirs male of the body lawfully begotten|
|Subsidiary titles||Baron Loughborough|
Baronet 'of Alva'
|Motto||Below the Shield: FIGHT|
Over the first Crest: RINASCO PIÙ GLORIOSO(I am reborn more glorious)
Over the 2nd Crest ILLÆSO LUMINE SOLEM(Enjoy the sun with unimpaired light)
Earl of Rosslyn is a title in the Peerage of the United Kingdom.  It was created in 1801 for Alexander Wedderburn, 1st Baron Loughborough, Lord Chancellor from 1793 to 1801, with special remainder to his nephew Sir James St Clair-Erskine, as Wedderburn had no surviving issue of his own. Wedderburn had already been created Baron Loughborough, of Loughborough in the County of Leicester, in the Peerage of Great Britain in 1780,  with normal remainder to the heirs male of his body, and Baron Loughborough, of Loughborough in the County of Surrey, in the Peerage of Great Britain in 1795,  with the same remainder as the earldom. The 1780 barony became extinct upon his death, but the 1795 barony and the earldom passed, by the special remainder, to his nephew, who thus became the second Earl of Rosslyn. The second Earl was a Lieutenant-General in the Army and also held political office as Lord Privy Seal and Lord President of the Council.
His son, the third Earl, was a General in the Army and held political office as Master of the Buckhounds and Under-Secretary of State for War. He was succeeded by his son, the fourth Earl. He served as Captain of the Honourable Corps of Gentlemen-at-Arms (Chief Government Whip in the House of Lords [ dubious ]) in Lord Salisbury's second Conservative administration.
As of 2015 [update] , the titles are held by his great-great-grandson, the seventh Earl, who succeeded his father in 1977. He is a former police officer with the Metropolitan Police Service. Lord Rosslyn is also one of the ninety elected hereditary peers that remain in the House of Lords after the passing of the House of Lords Act 1999, and sits as a cross-bencher.
The Erskine Baronetcy, of Alva in the County of Clackmannan, was created in 1666 for Charles Erskine in the Baronetage of Nova Scotia. He represented Clackmannan and Stirling in the Parliament of Scotland. His eldest son, the second Baronet, was killed at the Battle of Landen in 1693. He was succeeded by his younger brother, the third Baronet. He was one of the Scottish representatives to the 1st Parliament of Great Britain and later represented Clackmannanshire. His eldest son, the fourth Baronet, was killed at the Battle of Lauffeld in 1747. His younger brother and successor, the fifth Baronet, was a Lieutenant-General in the Army and sat as Member of Parliament for Ayr Burghs and Anstruther Easter Burghs. Erskine married Janet Wedderburn, daughter of Peter Wedderburn and sister of Alexander Wedderburn, 1st Earl of Rosslyn. He was succeeded by his son, the aforementioned sixth Baronet, who in 1805 succeeded his uncle Lord Rosslyn in the barony of Loughborough and earldom of Rosslyn. See above for further history of the baronetcy.
The family seat is Rosslyn Castle in Midlothian, Scotland. The Earl also owns Rosslyn Chapel.
The heir apparent is the present holder's son, Jamie William St Clair-Erskine, Lord Loughborough (b. 1986).
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Earl of Wemyss is a title in the Peerage of Scotland created in 1633. The Scottish Wemyss family had possessed the lands of Wemyss in Fife since the 12th century. Since 1823 the earldom has been held with the Earldom of March, created in 1697. The holder of the title is sometimes known as the Earl of Wemyss and March, but the titles are distinct.
Alexander Wedderburn, 1st Earl of Rosslyn, PC, KC was a Scottish lawyer and politician who sat in the House of Commons between 1761 and 1780 when he was raised to the peerage as Baron Loughborough. He served as Lord High Chancellor of Great Britain from 1793 to 1801.
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James St Clair-Erskine, 2nd Earl of Rosslyn,, known as Sir James Erskine, Bt, between 1765 and 1789 and as Sir James St Clair-Erskine, Bt, between 1789 and 1805, was a Scottish soldier, politician, slave holder, and Acting Grand Master of the Grand Lodge of Scotland, on behalf of King George IV.
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General James Alexander St Clair-Erskine, 3rd Earl of Rosslyn PC, DL, styled Lord Loughborough from 1805 to 1837, was a Scottish soldier and Tory politician. A General in the British Army, he also held political office as Master of the Buckhounds between 1841 and 1846 and again in 1852 and as Under-Secretary of State for War in 1859.
Robert Francis St Clair-Erskine, 4th Earl of Rosslyn, styled Lord Loughborough from 1851 until 1866, was a British Conservative politician. He served as Captain of the Gentlemen-at-Arms under Lord Salisbury between 1886 and 1890.
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Clan Wedderburn is a Lowland Scottish clan.
Baron of Roslin or Rosslyn was a Scottish feudal barony held by the St Clair or Sinclair family.
Anthony Hugh Francis Harry St Clair-Erskine, styled Lord Loughborough from 1929 to 1939, was a British peer. The Earl's lands included the noted Rosslyn Chapel.
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