question: What is the date of death of Yuan Qigui's husband?
context: [["Empress Yuan", ["Empress Yuan may refer to:"]], ["2011 Empress's Cup", ["Statistics of Empress's Cup in the 2011 season."]], ["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."]], ["2016 Empress's Cup", ["Statistics of Empress's Cup in the 2016 season."]], ["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.\""]], ["2010 Empress's Cup", ["Statistics of Empress's Cup in the 2010 season."]], ["2014 Empress's Cup", ["Statistics of Empress's Cup in the 2014 season."]], ["Emperor Wen of Song", ["Emperor Wen of (Liu) Song ((\u5289)\u5b8b\u6587\u5e1d, (Liu)", "Song Wen-di)", "(407 \u2013 16 March 453)", ", personal name Liu Yilong (\u5289\u7fa9\u9686), courtesy name", "Che'er (\u8eca\u5152), was an emperor of the Chinese dynasty Liu Song.", "He was the third son of the dynastic founder Emperor Wu (Liu Yu).", "After his father's death in 422, Liu Yilong's eldest brother Liu Yifu took the throne as Emperor Shao.", "In 424, a group of officials, believing Emperor Shao to be unfit to be emperor, deposed Emperor Shao and placed Liu Yilong on the throne as Emperor Wen.", "In his 29 years of rule, Emperor Wen largely continued the grand plan of his father and some of the land policies of the Jin Dynasty.", "The period, called the \"Yuanjia administration\" (\u5143\u5609\u4e4b\u6cbb), is seen as a period of prosperity and strength, because of the emperor's diligence and ability to find capable and honest officials to serve in his administration.", "However, Emperor Wen was faulted for making repeated failed attempts to attack rival Northern Wei and using the wrong strategies in doing so, weakening his state toward the end of his rule.", "In 453, angry that his crown prince Liu Shao was using witchcraft to curse him, he planned to depose Liu Shao; when this plan was leaked, Liu Shao staged a coup and assassinated him, replacing him on the throne, although less than a year later Liu Shao's younger brother Liu Jun defeated him and took the throne as Emperor Xiaowu."]], ["Yuan Qigui", ["Yuan Qigui (\u8881\u9f4a\u5aaf) (405\u2013440),", "formally Empress Yuan (\u5143\u7687\u540e, literally \"the discerning empress\") was an empress of the Chinese dynasty Liu Song.", "Her husband was Emperor Wen (Liu Yilong).", "Yuan Qigui was the daughter of the official Yuan Dan", "(\u8881\u6e5b) and", "his concubine, Concubine Wang, but her mother was of such low status that Yuan Dan did not let others know of Yuan Qigui's existence until she was four or five.", "She married Liu Yilong when he was still the Prince of Yidu, and she bore him his oldest son Liu Shao and a daughter, Liu Ying'e (\u5289\u82f1\u5a25), later the Princess Dongyang.", "After key imperial officials concluded that his brother Emperor Shao was unfit to be emperor, they deposed and killed Emperor Shao in 424 and offered the throne to Liu Yilong.", "Liu Yilong accepted, and took the throne as Emperor Wen.", "Later that year, he created her empress.", "It was around this time, either right before or right after Emperor Wen became emperor, that Empress Yuan bore him Liu Shao.", "According to traditional histories, when she observed her son's face, she remarked that this child would bring disaster on the house, and was ready to kill her child.", "Emperor Wen, hearing this, rushed to her bedchambers and forced her to spare the child.", "(Some later historians, including Bo Yang, doubted this account.)", "However, because he was still within the three-year mourning period for his father Emperor Wu and supposed to abstain from sexual relations, he hid Liu Shao's birth from the public and only announced it in 426.", "Emperor Wen initially favored Empress Yuan greatly.", "Because the Yuan clan was a poor one, she often requested him to give her money so that she could give them to her clan.", "Emperor Wen, known as a thrifty man, refused to give her much.", "Later on, he began to favor Consort Pan greater than her, and she, in order to test Emperor Wen's affection for her, asked Consort Pan to request an amount of money six to 10 times greater than what Emperor Wen had been giving her.", "Emperor Wen approved Consort Pan's request, and from this point on Empress Yuan was filled with anger.", "Whenever Emperor Wen wished to see her, she would try to hide from him, and she also refused to see her stepchildren.", "She grew ill in her anger, and in 440 she grew very ill.", "Emperor Wen went in to see her and, crying, held her hands to ask what request she had.", "She looked at him for a long time and then, without saying anything, covered her face with a blanket and refused to look at him again.", "She soon died.", "Emperor Wen mourned her greatly, and had the talented writer Yan Yanzhi (\u984f\u5ef6\u4e4b) write a beautiful ode dedicated to her."]], ["2006 Empress's Cup", ["Statistics of Empress's Cup in the 2006 season."]]]
supporting_facts: [["Yuan Qigui", 2], ["Emperor Wen of Song", 2]]
evidences: [["Yuan Qigui", "spouse", "Liu Yilong"], ["Liu Yilong", "date of death", "453"]]
answer: 453