Question: In what year was the British explorer that is a descendent of the 16th Baron Saye and Sele born?

Context paragraphs:
Baron Saye and Sele: Baron Saye and Sele is a title in the Peerage of England.  The title dates from the 15th Century and is extant.

Geoffrey Twisleton-Wykeham-Fiennes, 18th Baron Saye and Sele: Geoffrey Twisleton-Wykeham-Fiennes, 18th Baron Saye and Sele

Richard Fiennes, 7th Baron Dacre: Richard Fiennes, "jure uxoris" 7th Baron Dacre (1415 - 25 November 1483) 'of the South' in Herstmonceux Castle, Sussex, England, was the son of Sir Roger Fiennes and Elizabeth Holland.  His paternal uncle was James Fiennes, 1st Baron Saye and Sele.

Twisleton-Wykeham-Fiennes baronets: The Twisleton-Wykeham-Fiennes Baronetcy, of Banbury in the County of Oxford, is a title in the Baronetage of the United Kingdom.  As of this date, it is held by Sir Ranulph Twisleton-Wykeham-Fiennes (born 1944), the third Baronet, a well-known adventurer and third cousin of actor Ralph Fiennes, and as a descendant of the 17th Baron Saye and Sele, also in remainder to this title.

Twisleton-Wykeham-Fiennes family: The Twisleton-Wykeham-Fiennes family are the descendents of the 16th Baron Saye and Sele who was born Frederick Benjamin Twistleton and adopted the surname Twisleton-Wykeham-Fiennes in 1849 by Act of Parliament.  He was the grandson of Thomas Twisleton, 13th Baron Saye and Sele and inherited the barony from his first cousin William Thomas Eardley-Twisleton-Fiennes in 1847.  The surname is frequently shortened to Fiennes.  Members of the family include the explorer Ranulph Fiennes and the actors Ralph Fiennes and Joseph Fiennes.

Richard Fiennes, 7th Baron Saye and Sele: Richard Fiennes, 7th and 1st Baron Saye and Sele (c.1557 - 6 February 1613) was an English peer and diplomat.

Eustace Fiennes: Fiennes was born in Reading, Berkshire, the second son of John Twisleton-Wykeham-Fiennes, 17th Baron Saye and Sele and his wife, Lady Augusta Hay-Drummond, a daughter of the 11th Earl of Kinnoull.  He was educated at Malvern College,

Ranulph Fiennes: Sir Ranulph Twisleton-Wykeham-Fiennes, 3rd Baronet, OBE (born 7 March 1944), commonly known as Ranulph "Ran" Fiennes ( ), is a British explorer and holder of several endurance records.  He is also a prolific writer and poet.

Viscount Saye and Sele: Viscount Saye and Sele was a title in the Peerage of England.  It was created on 7 July 1624 for William Fiennes, 8th Baron Saye and Sele and became extinct on the death of Richard Fiennes 6th Viscount on 29 July 1781.

Thomas Twisleton, 13th Baron Saye and Sele: Major General Thomas Twisleton, 13th Baron Saye and Sele (c. 1735 – 1 July 1788) was a British Army officer and peer.

Supporting paragraphs: Twisleton-Wykeham-Fiennes family Ranulph Fiennes
Answer: 1944