question: Who is Coirpre Mac Fogartaig'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."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["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."]], ["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."]], ["Fogartach mac N\u00e9ill", ["Fogartach Mac'Artain (died 724), sometimes called Fogartach ua Cernaich, was an Irish king who is reckoned a High King of Ireland.", "He belonged to the U\u00ed Chernaig sept of the S\u00edl n\u00c1edo Sl\u00e1ine branch of the southern U\u00ed N\u00e9ill.", "He was King of Brega and was the son of Niall mac Cernaig Sotal (died 701) and great-grandson of the high king Diarmait mac \u00c1edo Sl\u00e1ine (died 665)."]], ["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."]], ["Coirpre mac Fogartaig", ["Coirpre mac Fogartaig (died 771) was a King of Brega of the U\u00ed Chernaig sept of Lagore of the S\u00edl n\u00c1edo Sl\u00e1ine branch of the southern Ui Neill.", "He was the son of the high king Fogartach mac N\u00e9ill (died 724).", "He is not listed in the poem on the S\u00edl n\u00c1edo Sl\u00e1ine rulers in the \"Book of Leinster\", however at his death obit in the annals for 771 he is called King of Brega.", "His accession to the rule of the U\u00ed Chernaig sept in south Brega cannot be dated with certainty.", "His brother Fergus mac Fogartaig (died 751) is called King of South Brega at his death obit.", "The annals then record the deaths of his cousin Domnall mac \u00c1eda in 759 and his brother Finsnechta mac Fogartaig in 761 with no titles.", "As for his accession to all of Brega, the death of the Brega king D\u00fangal mac Amalgado of the rival northern U\u00ed Chonaing sept of Cnogba (Knowth) occurred in 759.", "Coirpre is first mentioned in the annals with regard to the death of his son Cellach, who was killed by robbers in 767.", "Then Coirpre is driven into exile in 769 by Donnchad Midi (died 797) of the rival southern Ui Neill branch of Clann Cholm\u00e1in based in Mide.", "A battle had been fought between the men of Mide and Brega in 766.", "The year after Coirpre's exile the men of southern Brega were defeated at the Battle of Bolgg B\u00f3inne in 770 and two members of the sept were slain, Cernach mac Flainn (a grandson of Fogartach) and Flaithbertach mac Flainn as well as the vassal king Uarchride mac Baeth of the Deisi Brega.", "This was in conjunction with a campaign of Donnchad Midi versus Leinster and may have been part of that or Donnchad may have defeated the men of southern Brega on is way home.", "Coirpre then reappears in the year 771 at his death obit with the title King of Brega."]], ["Conaire C\u00f3em", ["Conaire C\u00f3em(\" the beautiful\"), son of Mug L\u00e1ma, son of Coirpre Crou- Chend, son of Coirpre Firmaora, son of Conaire M\u00f3r, was, according to medieval Irish legend and historical tradition, the 111th High King of Ireland.", "He came to power on the death of his father- in- law Conn C\u00e9tchathach, and ruled for seven or eight years, at the end of which he was killed by Nemed, son of Sroibcenn, in the battle of Gruitine.", "He was succeeded by Conn's son Art."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]]]
supporting_facts: [["Coirpre mac Fogartaig", 1], ["Fogartach mac N\u00e9ill", 2]]
evidences: [["Coirpre mac Fogartaig", "father", "Fogartach mac N\u00e9ill"], ["Fogartach mac N\u00e9ill", "father", "Niall mac Cernaig Sotal"]]
answer: Niall mac Cernaig Sotal