John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
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.
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.
Cynfyn
King Cynfyn (died c. 615) was the King of Ergyng, a kingdom of south-east Wales in the early medieval period.
He was the son of Peibio Clafrog.
Gwrgan Fawr
Gwrgan Fawr
(meaning "Gwrgan the Great"; also, in Latin, Gurgantius; English, Fergus) (died c. 645) was a king of Ergyng, a south-east Welsh kingdom of the early medieval period.
He was the son of Cynfyn and rightful heir to the Ergyng throne which, however, was initially usurped by Gwrfoddw around AD 619.
Gwrgan probably fled Ergyng when his inheritance was seized by Gwrfoddw Hen.
He appears in four charters in the Book of Llandaff during the episcopate of Bishops Euddogwy and Inabwy.
Gwrgan later features as king in charters in the Book of Llandaff associated with Bishops Oudoceus and Iunapeius.
Little else is known of this monarch, despite his epithet, the Great.
Overlordship of Glywysing and Gwent
may, however, be indicated if he is identified with Gwrgan Frych (the Freckled) who features in the "Life of Saint Cadog".
This powerful lord, who ruled further west in Glywysing, granted the saint half the fishing rights on the Rivers Usk and Neath in return for the great sword of King Rhun Hir of Gwynedd and a fine new horse with all the trappings.
Cadog died some years before Gwrgan's reign, but the association may have really been with the saint's successors at Llancarfan Abbey.
Gwrgan ruled until about AD 645 when his sons, Caradog and Morgan, should have inherited the throne of Ergyng.
When Gwrgan died, the throne of Ergyng was inherited, not by his sons Caradog and Morgan, but by Athrwys, the son of his daughter, Onbrawst.
It appears that his son-in-law, King Meurig of Glywysing and Gwent, managed to seize power in the name of his son, Athrwys.
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.

Question: Who is Gwrgan Fawr's paternal grandfather?
Answer: Peibio Clafrog