question: Who is Hrólfr Gautreksson's paternal grandfather?
context: [["Gautrekr", ["Gautrekr was a legendary Geatish king who appears in several sources, such as \"Gautreks sagaHr\u00f3lfs saga GautrekssonarB\u00f3sa saga ok Herrau\u00f0sYnglinga sagaNafna\u00feulur\" (part of the \"Prose Edda\") and \"Af Upplendinga konungum\".", "He appears in different temporal settings, and he could represent different kings named Gautrekr, as the name simply means \"Geatish ruler\".", "In the various settings, he also has different offspring.", "However, all settings present him as the son of a Gaut or Gauti, and in one of the later settings, his father Gaut gave his name to G\u00f6taland (Geatland).", "In \"Nafna\u00feulur\", he is mentioned as one of the sea-kings, after his father Gauti."]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Hr\u00f3lfr Gautreksson", ["Hr\u00f3lfr Gautreksson was a legendary Geatish king who appears in \"Hr\u00f3lfs saga Gautrekssonar\" and probably in \"Hyndlulj\u00f3\u00f0\".", "\"Hr\u00f3lfs saga Gautrekssonar\" tells that he was the son of king Gautrek and when his father died, his elder brother Ketill became king.", "Hr\u00f3lfr would court and finally win the Swedish king Erik's daughter \u00deornbj\u00f6rg, who was a violent and proud transmasculine king.", "He later succeeded his brother as king.", "There is also an isolated stanza in \"Hyndlulj\u00f3\u00f0\" where Hr\u00f3lfr the Old appears.", "The names \u00deorir the Iron-Shield and Gr\u00edmr shows that the lines probably refer to \u00deorir and Gr\u00edmr \u00deorkelsson who appear with Hr\u00f3lfr in \"Hr\u00f3lfs saga Gautrekssonar\".", "Translations: \"Hrolf Gautreksson, a Viking romance\".", "Translated by Hermann P\u00e1lsson, Paul Geoffrey Edwards.", "University of Toronto Press, 1972.", "148 pages."]], ["Henry Bryant (naturalist)", ["Henry Bryant( May 12, 1820 \u2013 February 2, 1867) was an American physician and naturalist.", "He was the grandfather of Henry Bryant Bigelow."]], ["Prithvipati Shah", ["Prithvipati Shah( ?\u20131716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.", "He was the grandfather of Nara Bhupal Shah."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Fujiwara no Nagara", [", also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.", "He was the grandfather of Emperor Y\u014dzei."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]]]
supporting_facts: [["Hr\u00f3lfr Gautreksson", 1], ["Gautrekr", 3]]
evidences: [["Hr\u00f3lfr Gautreksson", "father", "Gautrek"], ["Gautrek", "father", "Gaut"]]
answer: Gaut