question: Who is William Busac's paternal grandfather?
context: [["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."]], ["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."]], ["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."]], ["William I, Count of Eu", ["William I, Count of Eu (978-after 1057), illegitimate son of Richard I, Duke of Normandy.", "Count of Eu and Count of Hi\u00e9mois.", "William succeeded his nephew, Gilbert, as Count of Eu and Hi\u00e9mois after his murder in 1040.", "William rebelled against his half-brother Richard II, Duke of Normandy, and was captured by Raoul d\u2019Ivry and imprisoned by Turquetil of Harcourt, former governor of William the Conqueror..", "He escaped five years later and, eventually, was pardoned by Richard and given leave to marry into the Harcourt family.", "William married Lesceline, daughter of Turquetil.", "William and Lesceline had three children:\nWilliam\u2019s son, Robert, succeeded him as count of Eu."]], ["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["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."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["William Busac", ["William Busac (1020-1076), son of William I, Count of Eu, and his wife Lesceline.", "Count of Eu, Count of Soissons, \"de jure uxoris\".", "William was given the nickname Busac by the medieval chronicler Robert of Torigni.", "William appealed to King Henry I of France, who gave him in marriage", "Adelaide, the heiress of the county of Soissons.", "Adelaide was daughter of Renaud", "I, Count of Soissons, and Grand Master of the Hotel de France.", "William then became Count of Soissons in right of his wife.", "William and Adelaide had four children:\nHis son Renaud became Count of Soissons upon William\u2019s death, and he was succeeded by his brother John."]], ["John Mackay (poet)", ["John Mackay( 1656\u20131754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross."]]]
supporting_facts: [["William Busac", 0], ["William I, Count of Eu", 0]]
evidences: [["William Busac", "father", "William I, Count of Eu"], ["William I, Count of Eu", "father", "Richard I"]]
answer: Richard I