question: What is the date of birth of Allegra Byron's mother?
context: [["Claire Clairmont", ["Clara Mary Jane Clairmont (27 April 1798 \u2013 19 March 1879), or Claire Clairmont as she was commonly known, was the stepsister of writer Mary Shelley and the mother of Lord Byron's daughter Allegra.", "She is thought to be the subject of a poem by Percy Bysshe Shelley."]], ["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."]], ["Les Richards", ["Les Richards( date of birth unknown) was an Australian rules footballer who played with North Melbourne in the Victorian Football League( VFL)."]], ["Allegra Byron", ["Clara Allegra Byron (12 January 1817 \u2013 20 April 1822) was the illegitimate daughter of the poet George Gordon, Lord Byron and Claire Clairmont.", "Born in Bath, England, she was initially named Alba, meaning \"dawn\", or \"white\", by her mother.", "At first she lived with her mother, her mother's stepsister, Mary Shelley, and Mary's husband Percy Bysshe Shelley.", "When she was fifteen months old, she was turned over to Byron, who changed her name to Allegra.", "Byron placed her with foster families and later in a Roman Catholic convent, where she died at age five of typhus or malaria."]], ["Terence Robinson", ["Terence D. Robinson( date of birth and death unknown) was a male wrestler who competed for England."]], ["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."]], ["Brian Saunders (weightlifter)", ["Brian Saunders( date of birth and death unknown) was a male weightlifter who competed for England."]], ["Pamela Jain", ["Pamela Jain is an Indian playback singer.", "Date of Birth:16th March."]]]
supporting_facts: [["Allegra Byron", 0], ["Claire Clairmont", 0]]
evidences: [["Allegra Byron", "mother", "Claire Clairmont"], ["Claire Clairmont", "date of birth", "27 April 1798"]]
answer: 27 April 1798