On 5 May 1776, Louisa married Scottish peer David Murray, then Viscount Stormont.[3] Thus she was known as the Viscountess Stormont. It was the viscount's second marriage, and he was thirty years older than Louisa. Their five children were:
Lieutenant-general The Hon. George Murray (1780–1848)
Major The Hon. Charles Murray (1781–1859), who married Elizabeth Law and had children
General Sir Henry Murray (1784–1860), who married Emily, daughter of Gerard de Vismé, and had children.[4]
Lady Caroline Murray (died 1867)
The family seat was Scone Palace, but the viscount was the British ambassador in Paris, where his close friend Madame du Deffand commented that his new wife "is pretty, she holds herself badly, and has not a charming manner, but her expression is full of intelligence".[5]Queen Marie Antoinette once spoke to Lady Stormont, but she was so struck with her majesty that she can't speak, the queen graciously continued talking as if Lady Stormont had addressed her.
Improvements to Scone Palace were worked on by George Paterson until 1783, when the house was considered suitable as a regular residence.
In 1776, Lord Stormont's uncle, William Murray, 1st Baron Mansfield was created Earl of Mansfield. He had no children of his own and so the title was created with a remainder to Louisa and her issue with Lord Stormont. The Complete Peerage notes: "The strange limitation of the Earldom in 1776 was doubtless owing to a notion then prevalent that no British peerage granted even in remainder to a Scottish peer would enable such peer to sit in Parliament. This was founded on the absurd resolution passed by the House of Lords in 1711 as to the like impotency of a British peerage granted to a peer of Scotland, which resolution was rescinded in 1782. Accordingly, in 1792, the limitation of the Earldom was made with a direct remainder to the grantee's nephew, though a peer of Scotland." Thus when her husband died in 1796, their son inherited the second creation. Louisa outlived her son and on her own death in 1843, the first creation was inherited by her grandson, William, the 4th earl.
Queen Charlotte sent a letter to Lady Mansfield on 5 January 1801 writing:
Madam, I have communicated the contents of your letter to his Majesty, who perfectly agrees with you & Mr Greville that the Princes of Orleans, being foreigners of distinction, should have leave to pass through Richmond Park. I should have answered yesterday had I not received the letter too late for the post.
I rejoice to hear that you are so well recovered after your confinement, but tho I do hear that the little boy (Robert) is equal in beauty to his sister, I hope not to displease when I say that dear sweet little Georgina will bear the prize with me.
I beg my compliments to Mr Greville & am my dear Lady Mansfield's affectionate friend.[7]
Her ladyship's portrait was painted by George Romney.[8] She died on 11 July 1843 and was buried in her second husband's family tomb in the chapter house at St Mary's, Warwick.[9]
^"Scotland Births and Baptisms, 1564-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XYKF-ZBS : 10 February 2018), Louisa Cathcart, 1 Jul 1758; citing ALLOA,CLACKMANNAN,SCOTLAND, reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,040,206.
^Sir James Balfour Paul, The Scots Peerage: founded on Wood's edition of Sir Robert Douglas's The Peerage of Scotland (Edinburgh, Scotland: David Douglas, 1904), volume VIII, page 209.
^"England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V52S-BBN : 10 February 2018), Robert Fulk Greville and Louisa Mansfield, 19 Oct 1797; citing Saint Mary-St Marylebone Road,St Marylebone,London,England, reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 942 B4HA V. 51, 942 B4HA V. 52, 942 B4HA V. 54, 942 B4HA V. 55, 942 B4HA V. 56, 942 B4HA V. 57.
