Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Dui Finn
Dui Finn, son of Sétna Innarraid, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He took power after killing his predecessor, and his father's killer, Siomón Brecc.
He ruled for ten years, before he was killed by Siomón's son Muiredach Bolgrach.
The "Lebor Gabála Érenn" synchronises his reign with those of Xerxes I (485–465 BC) and Artaxerxes I (465–424 BC) of Persia.
The chronology of Geoffrey Keating's "Foras Feasa ar Éirinn" dates his reign to 679–674 BCBC, that of the "Annals of the Four Masters" to 904–894 BC.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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 Yōzei.
Sétna Innarraid
Sétna Innarraid ("of wages, stipend, reward"), son of Bres Rí, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He is said to have been the first Irish king to pay his soldiers.
He ruled for twenty years, before he was killed by Siomón Brecc, grandson of Nuadu Finn Fáil.
The "Lebor Gabála Érenn" synchronises his reign with those of Darius the Great (522–485 BC) and Xerxes I (485–465 BC) of Persia.
The chronology of Geoffrey Keating's "Foras Feasa ar Éirinn" dates his reign to 705–685 BC, that of the "Annals of the Four Masters" to 930–910 BC.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Prithvipati Shah
Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.
He was the grandfather of Nara Bhupal Shah.

Question: Who is the paternal grandfather of Dui Finn?
Answer: Bres Rí