question: When was Bernard (Son Of Charles The Fat)'s father born?
context: [["Charles the Fat", ["Charles III (13 June 839 \u2013 13 January 888), also known as Charles the Fat, was the emperor of the Carolingian Empire from 881 to 888.", "A member of the Carolingian dynasty, Charles was the youngest son of Louis the German and Hemma, and a great-grandson of Charlemagne.", "He was the last Carolingian emperor of legitimate birth and the last to rule over all the realms of the Franks.", "Over his lifetime, Charles became ruler of the various kingdoms of Charlemagne's former empire.", "Granted lordship over Alamannia in 876, following the division of East Francia, he succeeded to the Italian throne upon the abdication of his older brother Carloman of Bavaria who had been incapacitated by a stroke.", "Crowned Emperor in 881 by Pope John VIII, his succession to the territories of his brother Louis the Younger (Saxony and Bavaria)", "the following year reunited the kingdom of East Francia.", "Upon the death of his cousin Carloman II in 884, he inherited all of West Francia, thus reuniting the entire Carolingian Empire.", "Usually considered lethargic and inept\u2014he is known to have had repeated illnesses and is believed to have suffered from epilepsy\u2014he twice purchased peace with Viking raiders, including at the infamous Siege of Paris (885\u2013886) which led to his downfall.", "The reunited empire did not last.", "During a coup led by his nephew Arnulf of Carinthia in November 887, Charles was deposed in East Francia, Lotharingia, and Kingdom of Italy.", "Forced into quiet retirement, he died of natural causes in January 888, just a few weeks after his deposition.", "The Empire quickly fell apart after his death, splintering into five separate successor kingdoms; the territory it had occupied was not entirely reunited under one ruler until the conquests of Napoleon."]], ["Les Richards", ["Les Richards( date of birth unknown) was an Australian rules footballer who played with North Melbourne in the Victorian Football League( VFL)."]], ["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.\""]], ["Bernard (son of Charles the Fat)", ["Bernard or Bernhard (c. 870 \u2013 891/2) was the only child of Emperor Charles the Fat.", "He was born of an unknown concubine and was thus considered illegitimate.", "Charles tried to make him his heir, but failed in two attempts.", "Charles tried to have Bernard recognised as his heir in 885, but met the opposition of several bishops.", "He had the support of Pope Adrian III, whom he invited to an assembly in Worms in October 885, but who died on the way, just after crossing the river Po.", "Hadrian was going to depose the obstructing bishops, as Charles doubted he could do this himself, and legitimise Bernard.", "Based on the unfavouring attitude of the chronicler of the Mainz continuation of the \"Annales Fuldenses\", the chief of Charles' opponents in the matter was probably Liutbert, Archbishop of Mainz.", "Because Charles had called together the \"bishops and counts of Gaul\" as well as the pope to meet him at Worms, it seems likely that he planned to make Bernard King of Lotharingia.", "Notker the Stammerer, who considered Bernard as a possible heir, wrote in his \"Deeds of CharlemagneI will not tell you [Charles the Fat] of this [the Viking sack of the Abbey of Pr\u00fcm] until I see your little son Bernard with a sword girt to his thigh.\"", "Perhaps Notker was awaiting Bernard's kingship, when Pr\u00fcm would be avenged.", "After the failure of his first attempt, Charles set about to try again, apparently having given up on having any legitimate children with his wife, Richardis.", "He had the term \"proles\" (offspring) inserted into his charters as it had not been in previous years, probably because he desired to legitimise Bernard.", "In early 886, Charles met the new Pope, Stephen V, and probably negotiated for the recognition of his son as his heir.", "When Stephen cancelled a planned meeting at Waiblingen on 30 April 887, Charles probably abandoned his plans for Bernard and instead adopted Louis of Provence as his son at Kirchen in May.", "It is possible, however, that the agreement with Louis was only designed to engender support for Bernard's subkingship in Lotharingia.", "After his father's death, Bernard became the focus of revolt for some Alemannian magnates.", "In 890, he rebelled against Arnulf of Carinthia and prevented the king from going into Italy as requested by Pope Stephen V. Bernard had the support of Count Ulrich of the Linzgau and Argengau and Bernard, Abbot of Saint Gall.", "Probably, he fled Alemannia for Italy and the protection of Arnulf's rival, King Guy, as recorded by the late medieval historian Gobelinus, who may have had a lost Carolingian work as his source.", "By the winter of 891/2, Bernard had returned to Alemannia.", "The revolt was finally put down by Solomon III, Bishop of Constance, and Hatto, Abbot of Reichenau.", "Arnulf entered Alemannia in the summer to redistribute lands.", "Bernard was killed by Rudolf, Duke of Rhaetia, and only then did the unrest in Alemannia cease.", "These events are not mentioned in the main East Frankish source, the \"Annals of Fulda\", rather they come from brief notices in the \"Annales Alamannici\" and \"Annales Laubacenses\", which record that in 890, \"Bernard, Charles's son, barely escaped the net\", and in 891 (which possibly should be 892), he \"was killed by Rudolf\", without specifying who Rudolf was."]], ["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."]], ["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."]], ["Pamela Jain", ["Pamela Jain is an Indian playback singer.", "Date of Birth:16th March."]], ["Mark Kenneth Woods", ["Mark Kenneth Woods( date of birth unknown) is a Canadian comedy writer, actor, producer, director and TV host."]]]
supporting_facts: [["Bernard (son of Charles the Fat)", 0], ["Charles the Fat", 0]]
evidences: [["Bernard", "father", "Charles the Fat"], ["Charles the Fat", "date of birth", "839"]]
answer: 839