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He was the grandfather of singer/ poet Leonard Cohen.
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Fíacha Sroiptine
Fiacha Sraibhtine, son of Cairbre Lifechair, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
On his father's death, Fothad Cairpthech and Fothad Airgthech, sons of Lugaid mac Con, had taken the throne jointly, but within the year Fothad Airgthech killed his brother.
Fíacha and the "fianna" then defeated and killed Fothad in the Battle of Ollarba.
Fíacha's son, Muiredach Tirech, commanded his armies, as the king himself was not allowed to go into battle.
Once, Muiredach led a victorious expedition to Munster.
The Three Collas—Colla Uais, Colla Fo Chri and Colla Menn, sons of Fíacha's brother Eochaid Doimlén—gave battle to Fíacha while Muiredach and his army were still in Munster.
Fíacha's druid, Dubchomar, prophesied that if Fíacha was to defeat the Collas, none of his descendants would ever rule Ireland, and likewise, if the Collas won, none of their descendants would be king after them.
Fíacha was defeated and killed in what became known as the Battle of Dubchomar.
Fíacha had ruled for 31, 33, 36 or 37 years.
The chronology of Geoffrey Keating's "Foras Feasa ar Éirinn" dates his reign to 273–306, the "Annals of the Four Masters" to 285–322.
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He was the grandfather of Emperor Yōzei.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Cairbre Lifechair
Cairbre Lifechair ("lover of the Liffey"), son of Cormac mac Airt, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He came to the throne after the death of Eochaid Gonnat.
During his time Bresal Belach was king of Leinster, and refused to pay the "bórama" or cow-tribute to the High King, but Cairbre defeated him in the Battle of Dubchomar, and from then on exacted the "bórama" without a battle.
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He was the grandfather of Nara Bhupal Shah.
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Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.

Question: Who is Fíacha Sroiptine's paternal grandfather?
Answer: Cormac mac Airt