John Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Art Imlech
Art Imlech, ("having an edge or border" or "bordering on a lake or marsh") son of Elim Olfínechta, was, according to medieval Irish legend and historical tradition, a High King of Ireland, who took power after killing his predecessor, and his father's killer, Gíallchad.
He is said to have dug seven forts in a reign that lasted twelve or twenty-two years, before he was killed in battle by Gíallchad's son Nuadu Finn Fáil.
The "Lebor Gabála Érenn" synchronises his reign with those of Phraortes (665–633 BC) and Cyaxares (625–585) of the Medes.
The chronology of Geoffrey Keating's "Foras Feasa ar Éirinn" dates his reign to 777–755 BC, that of the "Annals of the Four Masters" to 1014–1002 BC.
Elim Olfínechta
Elim Olfínechta, son of Rothechtaid Rotha, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He succeeded to the throne after his father was struck by lightning.
Snow that tasted of wine (Old Irish "ollgreat, amplefínwinesnechtasnow") is said to have fallen in his reign.
He ruled for only one year, before he was killed by Gíallchad, grandson of Sírna Sáeglach, the High King who had been overthrown by Elim's father.
The "Lebor Gabála Érenn" synchronises his reign with that of Phraortes of the Medes (665-633 BC).
The chronology of Geoffrey Keating's "Foras Feasa ar Éirinn" dates his reign to 787–786 BC, that of the "Annals of the Four Masters" to 1024–1023 BC.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Zhao Shoushan
Zhao Shoushan( 12 November 1894 – 20 June 1965) was a KMT general and later Chinese Communist Party politician.
He is the grandfather of Zhao Leji.

Question: Who is the paternal grandfather of Art Imlech?
Answer: Rothechtaid Rotha