question: Who is Yujiulü Doulun's paternal grandfather?
context: [["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["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."]], ["Yujiul\u00fc Anluochen", ["Yujiul\u00fc Anluochen( pinyin: Y\u00f9ji\u01d4l\u01d8 \u0100nlu\u00f3ch\u00e9n)( ?- 554) was the last khagan of the Rouran( 553 -554) in the east.", "He was the son of Yujiul\u00fc Anagui."]], ["Yujiul\u00fc Poluomen", ["Yujiul\u00fc Poluomen was a khagan of Rouran with the title Mioukesheju Khagan( \u5f4c\u5076\u53ef\u793e\u53e5\u53ef\u6c57).", "He was a grandson of Yujiul\u00fc Nagai and a cousin of Yujiul\u00fc Anagui."]], ["Yujiul\u00fc Doulun", ["Yujiul\u00fc Doulan (pinyin: Y\u00f9ji\u01d4l\u01d8 D\u00f2ul\u00fan)", "(?", "-492)", "was khagan of the Rouran (485-492) with the title of Fumingdun Khagan (\u4f0f\u540d\u6566\u53ef\u6c57).", "He was the son of Yujiul\u00fc Yucheng."]], ["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."]], ["Yujiul\u00fc Yucheng", ["Yujiul\u00fc Yucheng (pinyin: Y\u00f9ji\u01d4l\u01d8 Y\u00fach\u00e9ng)", "(?", "-485) was ruler of the Rouran (464-485) with the title of Shouluobuzhen Khagan (\u53d7\u7f85\u90e8\u771f\u53ef\u6c57).", "He was the first Rouran ruler to adopt Chinese style era name, which was Yongkang (\u6c38\u5eb7 Y\u01d2ngk\u0101ng 464-484).", "He was the elder son of Yujiul\u00fc Tuhezhen."]], ["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]]]
supporting_facts: [["Yujiul\u00fc Doulun", 4], ["Yujiul\u00fc Yucheng", 4]]
evidences: [[" Yujiul\u00fc", "father", "Yujiul\u00fc Yucheng"], ["Yujiul\u00fc Yucheng", "father", "Yujiul\u00fc Tuhezhen"]]
answer: Yujiulü Tuhezhen