question: When was Britannicus's father born?
context: [["Britannicus", ["Tiberius Claudius Caesar Britannicus (c. 12 February AD 41 \u2013 11 February AD 55), usually called Britannicus, was the son of Roman emperor Claudius and his third wife Valeria Messalina.", "For a time he was considered his father's heir, but that changed after his mother's downfall in 48, when it was revealed she had engaged in a bigamous marriage without Claudius' knowledge.", "The next year, his father married Agrippina the Younger, Claudius' fourth and final marriage.", "Their marriage was followed by the adoption of Agrippina's son, Lucius Domitius, whose name became Nero as a result.", "His step-brother would later be married to his sister Octavia, and soon eclipsed him as Claudius' heir.", "Following his father's death in October 54, Nero became emperor.", "The sudden death of Britannicus shortly before his fourteenth birthday is reported by all extant sources as a poisoning on Nero's orders\u2014as Claudius' natural son, he represented a threat to Nero's claim to the throne."]], ["Brian Saunders (weightlifter)", ["Brian Saunders( date of birth and death unknown) was a male weightlifter who competed for England."]], ["Terence Robinson", ["Terence D. Robinson( date of birth and death unknown) was a male wrestler who competed for England."]], ["Les Richards", ["Les Richards( date of birth unknown) was an Australian rules footballer who played with North Melbourne in the Victorian Football League( VFL)."]], ["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."]], ["Mark Kenneth Woods", ["Mark Kenneth Woods( date of birth unknown) is a Canadian comedy writer, actor, producer, director and TV host."]], ["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.\""]], ["Moffat Sinkala", ["Moffat Sinkala( date of birth unknown, died June 2004) was a Zambian footballer.", "He competed in the men's tournament at the 1980 Summer Olympics."]], ["Pamela Jain", ["Pamela Jain is an Indian playback singer.", "Date of Birth:16th March."]], ["Claudius", ["Claudius (1 August 10 BC \u2013 13 October AD 54) was a Roman emperor from AD 41 to 54.", "Born to Drusus and Antonia Minor at Lugdunum in Roman Gaul, where his father was stationed as a military legate, he was the first Roman emperor to be born outside Italy.", "Nonetheless, Claudius was an Italic of Sabine origins and a member of the Julio-Claudian dynasty.", "Because he was afflicted with a limp and slight deafness due to sickness at a young age, his family ostracized him and excluded him from public office until his consulship, shared with his nephew Caligula in 37.", "Claudius's infirmity probably saved him from the fate of many other nobles during the purges of Tiberius' and Caligula's reigns; potential enemies did not see him as a serious threat.", "His survival led to his being declared emperor by the Praetorian Guard after Caligula's assassination, at which point he was the last man of his family.", "Despite his lack of experience, Claudius proved to be an able and efficient administrator.", "He expanded the imperial bureaucracy to include freedmen, and helped to restore the empire's finances after the excess of Caligula's reign.", "He was also an ambitious builder, constructing many new roads, aqueducts, and canals across the Empire.", "During his reign the Empire started its successful conquest of Britain.", "Having a personal interest in law, he presided at public trials, and issued up to twenty edicts a day.", "He was seen as vulnerable throughout his reign, particularly by elements of the nobility.", "Claudius was constantly forced to shore up his position; this resulted in the deaths of many senators.", "These events damaged his reputation among the ancient writers, though more recent historians have revised this opinion.", "Many authors contend that he was murdered by his own wife.", "After his death in 54 (at the age of 63), his grand-nephew, step-son, and adopted son Nero succeeded him as emperor.", "His 13-year reign (slightly longer than Nero's) would not be surpassed by any successors until that of Domitian, who reigned for 15 years.", "He was a descendant of the Octavii Rufi (through Gaius Octavius), Julii Caesares (through Julia Minor and Julia Antonia), and the Claudii Nerones (through Nero Claudius Drusus).", "He was a step-grandson (through his father Drusus) and great-nephew (through his mother Antonia Minor) of Augustus.", "He was a nephew of Tiberius through his father, Tiberius's brother.", "Through his brother Germanicus, Claudius was an uncle of Caligula and a great uncle of Nero.", "Through his mother Antonia Minor he was a grandson of Mark Antony and Octavia Minor."]]]
supporting_facts: [["Britannicus", 0], ["Claudius", 0]]
evidences: [["Britannicus", "father", "Claudius"], ["Claudius", "date of birth", "1 August 10"]]
answer: 1 August 10