Peter George Grenfell, 2nd Baron St. Just (22 July 1922 – 1984) was an English peer, a member of the House of Lords from 1943 until his death.
Life Grenfell was the only son of Edward Grenfell, a partner in Morgan, Grenfell & Co., director of the Bank of England, and Member of Parliament for the City of London, and his wife Florence Emily Henderson.Charles Mosley, ed., Burke's Peerage, Baronetage & Knightage, 107th edition, volume 2 (2003), p. 1658 He was educated at Sandroyd School and Harrow School."Lord St Just", The Times, issue 61973, 30 October 1984, p. 12 In July 1935, while he was still there, his father was raised to the peerage as Baron St Just, of St Just in Penwith in the County of Cornwall.The London Gazette, Issue 34176, 2 July 1935, p. 4241
During the Second World War, Grenfell was commissioned as a Lieutenant into the King's Royal Rifle Corps. On 26 November 1941, his father died and he succeeded as Lord St Just, but could not take his seat in the House of Lords until reaching the age of twenty-one two years later.
On 1 June 1949, at St James's, Spanish Place, St Just married Leslie Nast, daughter of Condé Nast and Leslie Foster.Marriages - Lord St. Just and Miss L. Nast, The Times, issue 51397, 2 June 1949, p. 7 They were divorced in 1955, and on 25 July 1956 he married secondly Maria Britneva, a Russian-born actress, the daughter of Alexander Britnev, whose mother had brought her to England as a child.Kit Hesketh-Harvey, "Obituary: Maria St Just", The Independent, 24 February 1994, accessed 4 December 2020 They lived at Wilbury House in Wiltshire; Maria continued to live there until her death in 1994.
By his first wife, St Just was the father of Laura Claire Grenfell (born 1950), and by Maria Britneva he had two further daughters, Katherine Grenfell (1957), known as Pulcheria,Kim Hubbard, "The Original Maggie the Cat, Maria St. Just, Remembers Her Loving Friend Tennessee Williams", People, 2 April 1990, accessed 7 December 2020 and Natasha Jeannine Mary Grenfell (1959). His daughter Katherine married Oliver Gilmour.
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