Sir Lancelot Douglas Carnegie, GCVO, KCMG, PC (26 December 1861 – 15 October 1933), sometime British Minister and then Ambassador and Minister Plenipotentiary to the Republic of Portugal in 1925, was the second son of the 9th Earl of Southesk, and the eldest son by his second marriage (1860) to Lady Susan Murray (died 1915), eldest daughter of Alexander Murray, 6th Earl of Dunmore. His matrilineal great-uncle was the diplomat and statesman Sidney Herbert, Lord Herbert of Lea.
- MVO : Member (fourth class) of the Royal Victorian Order - 11 Oct 1901
- GCVO : Knight Grand Cross of the Royal Victorian Order
- KCMG : Knight Commander of the Order of St Michael and St George - 1916 New Year Honours
In 1924 he was appointed to the Privy Council, entitling him to the style "The Right Honourable".
Carnegie was married in 1890 to Marion Alice de Gournay Barclay, (1868-23 August 1961, died aged 93), daughter of Henry Ford Barclay. According to their granddaughter Lady John Kerr, Marion lost her hearing at the age of 30, but this did not stop her leading a full life. Lady Carnegie was the daughter of Henry Ford Barclay by his first wife Richenda Louisa Gurney (d. 1888) the youngest daughter of Samuel Gurney, of Ham House, Upton Park, himself of the landed family Gurney of Walsingham Abbey, Norfolk.
The Carnegies had three children
- James Murray Carnegie (1909–1985), who married 1939, Diana Winifred Mary Renshaw, daughter of Henry Arthur Renshaw. They had issue five daughters, including twins (the two youngest), but two daughters died very young.
- Mariota Susan Carnegie (1892-) later Lady Gurney, married 1911, Sir Hugh Gurney (1878-1968), sometime British Ambassador to Brazil, and to Denmark in 1933, and in 1947, the chief secretary of the British Palestine government in 1947., son of John Gurney and his wife Isabel Blake-Humfrey (later wife of the 2nd Baron Talbot de Malahide); they had issue three sons and three daughters, of whom the second married Lord John Kerr, younger brother of the 12th Marquess of Lothian and the third (Susan) Richenda (b. 1937) married the 2nd Lord Elton.
- Dorothea Helena Carnegie (1906–1985) later Countess of Mansfield & Mansfield; married 1928, Mungo David Malcolm Murray, 7th Earl of Mansfield (1900–1971), then Viscount Stormont. They had issue one son (the present Earl) and two daughters (including the present Countess of Moray).
- Lancelot Carnegie (1861-1933)
- The London Gazette: . 11 October 1901.
- Marion Carnegie's dates
- Memorial for Mr Henry Ford Barclay (1826- Nov 1891). Families of Brickendon: The Barclays says "in 1865 HF Barclay became a director of the bank Overend Gurney & Co, which crashed rather spectacularly the following year. HFB later became a partner in another of the Gurney’s banks and in 1896 the banks of the Barclays and the Gurneys merged." Her brother Charles Theodore Barclay (1867-1921)and his wife, Josephine Lister (neé Harrison) (1870-1950) had five known children: Margaret Emily, Christopher Gurney (1897-1962) who had no children, Juliet Richenda, Anthony Lister and Theodora Mary (1906-1990). An early Barclay genealogy provides some indications of Barclay-Gurney intermarriages; however, the Barclays of Runcton are not clearly related to these Barclays.
- He made headlines first in 1903 as Third Secretary to the British Embassy, when he was arrested and fined in Massachusetts for a traffic violation. He is sometimes confused with Henry Gurney, the British High Commissioner to Malaya assassinated in 1951.
- Richenda, Lady Elton, (Richenda Gurney); was an Extra Woman of the Bedchamber. Her husband is a Tory politician and hereditary peer elected to the House of Lords