question: Who is Eochaid Mac Fiachnai's paternal grandfather?
context: [["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["Fiachnae mac \u00c1edo R\u00f3in", ["Fiachnae mac \u00c1edo R\u00f3in (died 789) was a D\u00e1l Fiatach ruler of the over-kingdom of Ulaid in Ireland.", "He reigned from 750 to 789.", "He was the son of \u00c1ed R\u00f3in (died 735) and brother of Bressal mac \u00c1edo R\u00f3in (died 750), previous kings.", "This family had their base in modern-day County Down, Northern Ireland."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Eochaid mac Fiachnai", ["Eochaid mac Fiachnai (died 810) was a Dal Fiatach king of Ulaid, which is now Ulster, Ireland.", "He was the son of Fiachnae mac \u00c1edo R\u00f3in (died 789), a previous king.", "He ruled from 790 to 810.", "Eochaid first appears in the annals in 776.", "In that year he gave his support to Tommaltach mac Indrechtaig (died 790) in a civil war among the rival Dal nAraide family.", "They defeated and slew the incumbent king Cin\u00e1ed Ciarrge mac Cathussaig and his ally, D\u00fangal king of the U\u00ed Tuirtri (an Airgialla tribe west of Lough Neagh) at the Battle of Drong.", "His father had restored the fortunes of the Dal Fiatach dynasty but upon his death a succession struggle broke out.", "Eochaid was challenged for the kingship by his kinsmen Tommaltach mac Cathail.", "Tommaltach was the great grandson of \u00d3engus, son of M\u00e1el Cobo mac Fiachnai (died 647) king of Ulaid and this branch (called the Cen\u00e9l n\u00d3engusa) threatened to be excluded from the throne.", "Tommaltach was defeated and slain in battle by Eochaid.", "However Tommlatach's branch of the family remained based in Leth Cathail (Lecale)-\"Cathal's Half\" in southern modern County Down (also known as Mag Inis).", "Tommaltach mac Indrechtaig of Dal nAraide had profited by the civil war among the Dal Fiatach to acquire the throne of all Ulaid.", "He died the next year in 790 and in that year the annals also record a slaughter of the Dal Fiatach by the D\u00e1l nAraidi.", "Whether this occurred before or after Tommaltach's death is uncertain.", "Eochaid became King of Ulaid in 790.", "In 801", "The Ulaid went to war with the U\u00ed Echach Cobo in the west part of county Down, probably to impose their authority.", "The Ulaid were victorious and slew the King of Coba, Eochu mac Aililla.", "On the side of the Ulaid, Cairell mac Cathail of the Leth Cathail branch was slain.", "In 809 the high king \u00c1ed Oirdnide campaigned against Ulaid and defeated them ravaging from the Bann to Strangford Lough.", "The motive for this conflict was apparently the killing of D\u00fanch\u00fa, superior of Tulach L\u00e9is (Tullylisk, County Down), by the Ulaid.", "A civil war then followed in which Eochaid was defeated by his brother Cairell mac Fiachnai (died 819).", "The annals report that Eochaid escaped from this battle and historians place his death in 810.", "Eochaid may be associated with the establishment of D\u00fan Echdach (Duneight) which became the royal seat of the Dal Fiatach as they shifted their power northwards by the 9th century from their old royal seat at Downpatrick.", "The sons of Eochaid included Muiredach mac Eochada (died 839), a King of Ulaid, and \u00c1ed mac Eochada who fathered three kings of Ulaid."]], ["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."]], ["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."]], ["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."]], ["Eochaid mac \u00c1eda Find", ["Eochaid mac \u00c1eda Find is a spurious King of D\u00e1l Riata found in some rare High Medieval king-lists and in older history books.", "Supposedly a son of \u00c1ed Find (died 778) and successor to \u00c1ed's brother Fergus mac Echdach, Eochaid is now thought to represent a misplacing of the reign of Eochaid mac Echdach.", "The reigns of Selbach mac Ferchair, D\u00fangal mac Selbaig and, perhaps, Alp\u00edn mac Echdach, are similarly misplaced in the sources which contain this Eochaid."]]]
supporting_facts: [["Eochaid mac Fiachnai", 1], ["Fiachnae mac \u00c1edo R\u00f3in", 2]]
evidences: [["Eochaid mac Fiachnai", "father", "Fiachnae mac \u00c1edo R\u00f3in"], ["Fiachnae mac \u00c1edo R\u00f3in", "father", "\u00c1ed R\u00f3in"]]
answer: Áed Róin