question: When did Harald Sigtryggsson's father die?
context: [["Harald Sigtryggsson", ["Harald Sigtryggsson (died 940) was a Viking leader who ruled Limerick in the early 10th century.", "He was the son of Sitric C\u00e1ech and great-grandson of \u00cdmar, making him one of the U\u00ed \u00cdmair.", "He was installed as king of Limerick following the capture of the previous king Olaf Scabby-head by Harald's cousin Olaf Guthfrithson, king of Dublin, during a battle at Lough Ree in 937.", "Harald died in 940 and was ultimately succeeded by Ivar of Limerick."]], ["Harry Johnson (wrestler)", ["Harry Johnson( 1903- date of death unknown) was an English wrestler."]], ["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.\""]], ["Sitric C\u00e1ech", ["Sitric C\u00e1ech or Sihtric C\u00e1ech or Sigtrygg G\u00e1le, (died 927) was a Viking leader who ruled Dublin and then Viking Northumbria in the early 10th century.", "He was a grandson of \u00cdmar and a member of the U\u00ed \u00cdmair.", "Sitric was most probably among those Vikings expelled from Dublin in 902, whereafter he may have ruled territory in the eastern Danelaw in England.", "In 917, he and his kinsman Ragnall ua \u00cdmair sailed separate fleets to Ireland where they won several battles against local kings.", "Sitric successfully recaptured Dublin and established himself as king, while Ragnall returned to England to become King of Northumbria.", "In 919, Sitric won a victory at the Battle of Islandbridge over a coalition of local Irish kings who aimed to expel the U\u00ed \u00cdmair from Ireland.", "Six Irish kings were killed in the battle, including Niall Gl\u00fandub, overking of the Northern U\u00ed N\u00e9ill and High King of Ireland.", "In 920 Sitric left Dublin for Northumbria, with his kinsman Gofraid ua \u00cdmair succeeding him as king.", "That same year he led a raid on Davenport, Cheshire, perhaps as an act of defiance against Edward the Elder, King of the Anglo-Saxons.", "In 921 Ragnall ua \u00cdmair died, with Sitric succeeding him as King of Northumbria.", "Though there are no written accounts of conflict, numismatic evidence suggests there was a Viking reconquest of a large part of Mercia in the following few years.", "An agreement of some sort between the Vikings of Northumbria and the Anglo-Saxons was achieved in 926 when Sitric married a sister of \u00c6thelstan, perhaps Edith of Polesworth.", "Sitric also converted to Christianity, though this did not last long and he soon reverted to paganism.", "He died in 927 and was succeeded by his kinsman Gofraid ua \u00cdmair.", "Sitric's son Gofraid later reigned as king of Dublin, his son Aralt as king of Limerick, and his son Amla\u00edb Cuar\u00e1n as king of both Dublin and Northumbria."]], ["Harry Wainwright (footballer)", ["Harry Wainwright( born 1899; date of death unknown) was an English footballer."]], ["Fred Bradley (rower)", ["Frederick Bradley( 1908- date of death unknown) was an English rower."]], ["Albert Thompson (footballer, born 1912)", ["Albert Thompson( born 1912, date of death unknown) was a Welsh footballer."]], ["Thomas Scott (diver)", ["Thomas Scott( 1907- date of death unknown) was an English diver."]], ["Bill Smith (footballer, born 1897)", ["William Thomas Smith( born 9 April 1897, date of death unknown) was an English professional footballer."]]]
supporting_facts: [["Harald Sigtryggsson", 1], ["Sitric C\u00e1ech", 0]]
evidences: [["Harald Sigtryggsson", "father", "Sitric C\u00e1ech"], ["Sitric C\u00e1ech", "date of death", "927"]]
answer: 927