question: What is the date of death of Julia Livia's father?
context: [["Albert Thompson (footballer, born 1912)", ["Albert Thompson( born 1912, date of death unknown) was a Welsh footballer."]], ["Harry Johnson (wrestler)", ["Harry Johnson( 1903- date of death unknown) was an English wrestler."]], ["Fred Bradley (rower)", ["Frederick Bradley( 1908- date of death unknown) was an English rower."]], ["Harry Wainwright (footballer)", ["Harry Wainwright( born 1899; date of death unknown) was an English footballer."]], ["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.\""]], ["Julia Livia", ["Julia Livia (c.7\u201343 AD), sometimes referred to as Julia Drusi Caesaris filia (Julia, daughter of Drusus Caesar), was the daughter of Drusus Julius Caesar and Livilla, and granddaughter of the Roman Emperor Tiberius.", "She was also a first cousin of the emperor Caligula, and niece of the emperor Claudius."]], ["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."]], ["Drusus Julius Caesar", ["Drusus Julius Caesar (14 BC \u2013 14 September AD 23), was the son of Emperor Tiberius, and heir to the Roman Empire following the death of his adoptive brother Germanicus in AD 19.", "He was born at Rome to a prominent branch of the \"gens Claudia\", the son of Tiberius and his first wife, Vipsania Agrippina.", "His name at birth was Nero Claudius Drusus after his paternal uncle, Drusus the Elder.", "In AD 4, he assumed the name \"Julius Caesar\" following his father's adoption into the Julii by Augustus, and became Drusus Julius Caesar.", "Drusus first entered politics with the office of quaestor in AD 10.", "His political career mirrored that of Germanicus, and he assumed all his offices at the same age as him.", "Following the model of Augustus, it was intended that the two would rule together.", "They were both popular, and many dedications have been found in their honor across Roman Italy.", "Cassius Dio calls him \"Castor\" in his \"Roman History\", likening Drusus and Germanicus to the twins, Castor and Pollux, of Roman mythology.", "Drusus died suddenly 14 September 23, seemingly from natural causes.", "Ancient historians, such as Tacitus and Suetonius, claim he died amid a feud with the powerful Sejanus, Praetorian prefect of Rome.", "They allege that he had been murdered.", "In their account, Sejanus had seduced his wife Livilla, and with the help of a doctor she had poisoned Drusus.", "Despite the rumors, Tiberius did not suspect Sejanus and the two remained friends until Sejanus' fall from grace in 31."]], ["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."]]]
supporting_facts: [["Julia Livia", 0], ["Drusus Julius Caesar", 9]]
evidences: [["Julia Livia", "father", "Drusus Julius Caesar"], ["Drusus Julius Caesar", "date of death", "14 September 23"]]
answer: 14 September 23