question: When did Francis Nathaniel Burton's father die?
context: [["Lord Francis Conyngham", ["Lord Francis Nathaniel Conyngham (24 September 1832 \u2013 14 September 1880) was an Irish politician who sat in the United Kingdom Parliament as a Member of Parliament."]], ["Harry Wainwright (footballer)", ["Harry Wainwright( born 1899; date of death unknown) was an English footballer."]], ["Theodred II (Bishop of Elmham)", ["Theodred II was a medieval Bishop of Elmham.", "The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997."]], ["Etan Boritzer", ["Etan Boritzer( born 1950) is an American writer of children \u2019s literature who is best known for his book\" What is God?\" first published in 1989.", "His best selling\" What is?\" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.", "Boritzer gained national critical acclaim after\" What is God?\" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.", "The other current books in the\" What is?\" series include", "What is Love?,", "What is Death?,", "What is Beautiful?,", "What is Funny?,", "What is Right?,", "What is Peace?,", "What is Money?,", "What is Dreaming?,", "What is a Friend?,", "What is True?,", "What is a Family?,", "What is a Feeling?\"", "The series is now also translated into 15 languages.", "Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.", "His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.", "Boritzer now lives in Venice, California and maintains his publishing office there also.", "He has helped numerous other authors to get published through\" How to Get Your Book Published!\" programs.", "Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.", "He is also recognized nationally as an erudite speaker on\" The Teachings of the Buddha.\""]], ["Francis Conyngham, 2nd Baron Conyngham", ["Francis Conyngham, 2nd Baron Conyngham (born Francis Pierpoint Burton; 1725 \u2013 22 May 1787) was an Irish peer and politician."]], ["Albert Thompson (footballer, born 1912)", ["Albert Thompson( born 1912, date of death unknown) was a Welsh footballer."]], ["Bill Smith (footballer, born 1897)", ["William Thomas Smith( born 9 April 1897, date of death unknown) was an English professional footballer."]], ["Harry Johnson (wrestler)", ["Harry Johnson( 1903- date of death unknown) was an English wrestler."]], ["Thomas Scott (diver)", ["Thomas Scott( 1907- date of death unknown) was an English diver."]], ["Francis Nathaniel Burton", ["Sir Francis Nathaniel Pierpoint Burton (26 December 1766 \u2013 27 January 1832) was a British colonial administrator in Lower Canada and Irish politician.", "Burton was the younger of twin sons born to Francis Conyngham, 2nd Baron Conyngham (born Burton), and his wife Elizabeth, daughter of Nathaniel Clements.", "Henry Conyngham, 1st Marquess Conyngham, was his elder twin brother.", "In 1781, his father changed his surname to Conyngham upon the death of his maternal uncle, the Earl Conyngham, upon inheriting the Conyngham barony upon special remainder.", "Burton sat as Member of Parliament (MP) in the Irish House of Commons for Killybegs in 1790 and 1798 and Clare from 1790 to the Act of Union in 1801.", "He sat then for Clare in the Parliament of the United Kingdom from 1801 to 1808.", "Burton was appointed Lieutenant-Governor of Lower Canada on 29 November 1808, but did not travel to Lower Canada until 1822, under threat of removal of his salary.", "During the absence of Governor George Ramsay, Burton acted as administrator of Lower Canada from 7 June 1824 \u2013 September 1825.", "Although he left Quebec City in October 1825 on a permanent \"leave of absence\", he remained the official Lieutenant Governor until his death in 1832.", "He married the Hon.", "Valentina Alicia Lawless, daughter of Nicholas Lawless, 1st Baron Cloncurry and Margaret Browne, and had four children."]]]
supporting_facts: [["Francis Nathaniel Burton", 1], ["Francis Conyngham, 2nd Baron Conyngham", 0]]
evidences: [["Sir Francis Nathaniel Pierpoint Burton", "father", "Francis Conyngham, 2nd Baron Conyngham"], ["Francis Conyngham, 2nd Baron Conyngham", "date of death", "22 May 1787"]]
answer: 22 May 1787