Martin Guy Fiennes, 22nd Baron Saye and Sele, (né Twisleton-Wykeham-Fiennes; born 27 February 1961),Charles Mosley (editor), Burke's Peerage, Baronetage and Knightage, 107th ed., vol. I (2003), p. 3667. styled as Lord Saye and Sele, is an English peer and businessman.The Oxford Lieutenancy, Martin Fiennes. Retrieved 29 January 2024.

Family and education Fiennes is the second son of Nathaniel Fiennes, 21st Baron Saye and Sele (1920−2024),The Banbury Guardian, "Obituary: Nathaniel Fiennes, 21st Baron Saye and Sele − known to Banbury simply as Lord Saye − dies aged 103", 23 January 2024. Retrieved 29 January 2024. who changed the family's surname from Twisleton-Wykeham-Fiennes to Fiennes by deed poll in 1965,The Times, "Lord Saye and Sele obituary", 29 January 2024. Retrieved 30 January 2024. and Mariette Helena Salisbury-Jones (born 1935) and a grandson of Sir Guy Salisbury-Jones. He became heir to the barony of Saye and Sele in 2001 following the death of his older brother, Richard, from epilepsy.The Guardian, "An Englishman's castle", 10 April 2009. Retrieved 29 January 2024. His twin sister is the artist Susannah Fiennes and his youngest brother is the writer William Fiennes; another brother, Thomas, died in a road accident in 1968 at the age of three.

A member of the Twisleton-Wykeham-Fiennes family, he is a cousin of the actor Ralph Fiennes and the explorer Sir Ranulph Fiennes.

After attending Eton College, Fiennes studied at Brasenose College, Oxford, before completing an MBA at Ashridge Management College.

On 28 September 1996 he married Pauline Kang Chai Lian, with whom he has three sons: Guy Fiennes (b. 1997), Ned Richard Ling Fiennes (b. 1999) and Ivo Fiennes (b. 2000).

Career Fiennes works in venture capital and joined Oxford Science Enterprises in 2015. He also manages the family seat, Broughton Castle, and in 2018 was appointed Deputy Lieutenant of Oxfordshire.The London Gazette, "Deputy Lieutenant Commissions: Lieutenancy of Oxfordshire", 1 March 2018 (issue 62217), p. 3894. Retrieved 29 January 2024.The Bucks Herald, "Six new deputies appointed by Lord-Lieutenant of Oxfordshire", 28 February 2018. Retrieved 29 January 2024.

He succeeded his father as Lord Saye and Sele in 2024.

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