question: Who is Knut Birgersson, Riksjarl Of Sweden's mother?
context: [["Dorothy Granger", ["Dorothy Karolyn Granger( November 21, 1911 \u2013 January 4, 1995) was an American actress best known for her roles in short subject comedies in Hollywood.", "She was also the stepmother of film maker and former record producer Anthony J. Hilder."]], ["Birger Brosa", ["Birger Brosa (Old Norse: \"Birgir Br\u00f3sa\" where \"Br\u00f3sa\" means \"smiling\"), jarl of Sweden 1174\u20131202, d. 9 January 1202 on Visings\u00f6, was a son of Bengt Snivil and a member of the powerful House of Bj\u00e4lbo.", "In the medieval texts he is either called the \"jarl of the Swedes\" or the \"jarl of the Swedes and the Geats\".", "Birger was appointed to the position of jarl during the reign of Knut Eriksson.", "He maintained the position during Knut's successor Sverker II until his death in 1202.", "Before 1170, Birger was married to Brigida Haraldsdotter, the daughter of the Norwegian king Harald Gille.", "She had formerly been married to the Danish pretender Magnus Henriksson, who had briefly ruled in Uppsala 1160\u20131161.", "Birger appears to have maintained peace in Sweden during the civil wars that ravaged Denmark and Norway.", "Many of the pretenders in these kingdoms sought refuge with Birger.", "Among them were the Birkebeiner chieftains Eystein Meyla and Sverre Sigurdsson who were kinsmen of Brigida Haraldsdotter.", "Birger's son Philippus was in the service of King Sverre and died as his Earl in 1200.", "Birger owned estates in \u00d6sterg\u00f6tland, N\u00e4rke, V\u00e4rmland and S\u00f6dermanland.", "He was a great donor to the convent of Riseberga in N\u00e4rke, where Birgitta spent her last years after Birger's death.", "As soon as he was dead, a civil war broke out."]], ["Jane Wigham", ["Jane Wigham( n\u00e9e Smeal; 1801\u20131888) was a leading Scottish abolitionist.", "She was the stepmother of Eliza Wigham and the second wife of John Wigham."]], ["Verona Barnes", ["Verona Barnes( born December 29, 1946) is an American actress who appeared in multiple New York City theater plays.", "She is the stepmother of actress Rachel True.", "Her roles include Mrs. Harris and the Street Person in\" All God's Chillun Got Wings,\" as well as Jack's friend in\" The Great White Hope\"."]], ["Livia Ocellina", ["Livia Ocellina was the second wife of Gaius Sulpicius Galba and the stepmother of the Roman Emperor Galba.", "According to Suetonius she was: Galba was raised by her and took on the name Lucius Livius Ocella( rather than his birth name of Servius Sulpicius Galba) during the period prior to his assumption of the purple."]], ["Henriette Feuerbach", ["Henriette Feuerbach( 13 August 1812 \u2013 5 August 1892) was a German author and arts patron.", "She was the wife of Joseph Anselm Feuerbach and the stepmother of painter Anselm Feuerbach, whom she supported in his art."]], ["May Green Hinckley", ["May Green Hinckley( May 1, 1881 \u2013 May 2, 1943) was the third general president of the Primary of The Church of Jesus Christ of Latter- day Saints( LDS Church) from 1940 until her death.", "She was the stepmother of Gordon B. Hinckley, fifteenth president of the LDS Church."]], ["Knut Birgersson, Riksjarl of Sweden", ["Knut Birgersson (Old Norse: \"", "Kn\u00fatr jarl Birgisson\", died 1208)", "was Riksjarl of Sweden.", "He was the eldest surviving son of Riksjarl Birger Brosa and a member of the powerful House of Bj\u00e4lbo.", "Knut Birgersson was apparently elevated to the office of Riksjarl during the last years of the reign of King Sverker II of Sweden.", "This was despite the fact that Sverker had named his infant son Johan Sverkersson as riksjarl following the death of Jarl Birger Brosa, in an attempt to confirm Johan as his royal successor and to diminish the power of highest nobility by effectively abolishing the position of riksjarl, so no adult noble could occupy it.", "Johan Sverkersson was the nephew of Knut Birgersson, being born of his sister .", "Sources are silent how and why Knut became jarl in Johan's lifetime, but either he got it as acompromise out of King Sverker, or Sverker actually needed an effective Riksjarl to his side.", "According to one source, Jarl Knut was married to daughter of King Canute I of Sweden, named Sigrid Knutsdotter.", "The same source states that Knut's son lord was born of Sigrid.", "Jarl Knut was killed in 1208 at the Battle of Lena, where King Sverker lost his throne to Canute's surviving son, the new king Eric X of Sweden."]], ["Susan Moody", ["Susan Moody( born 1940 in Oxford) is the principal\" nom de plume\" of Susan Elizabeth Horwood, an English novelist best known for her suspense novels.", "After marrying Professor John Dalgleish Donaldson in 2001, she became the stepmother of his four children, including Crown Princess Mary of Denmark."]], ["Irene Baker", ["Edith Irene Bailey Baker( November 17, 1901 \u2013 April 2, 1994) was an American politician and a United States Representative from Tennessee.", "She was the widow of Howard Baker Sr. and the stepmother of Howard Baker Jr."]]]
supporting_facts: [["Knut Birgersson, Riksjarl of Sweden", 3], ["Birger Brosa", 4]]
evidences: [["Knut Birgersson, Riksjarl of Sweden", "father", "Birger Brosa"], ["Birger Brosa", "spouse", "Brigida Haraldsdotter"]]
answer: Brigida Haraldsdotter