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.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Fiachnae mac Demmáin
Fiachnae mac Demmáin (died 627) was King of Ulaid from 626 to 627.
Sometimes called Fiachnae Dubtuinne.
He was a member of the Dal Fiatach and nephew of Baetan mac Cairill (died 581) of Ulaid.
He was the son of Demmán mac Cairell (died 572).
He succeeded his uncle as king of the Dal Fiatach in 581.
His first mention in the Irish annals is the battle of Cúl Caíl (possibly Kilkeel, modern County Down) in 601 where he was defeated by Fiachnae mac Baetain of the Dal nAraide.
The annals mention Fiachnae mac Baetan went against him
so was probably the aggressor.
This was part of the struggle of these two rival clans for the overlordship of Ulaid.
In 626 was fought the Battle of Leithit Midind at Drung (Knocklayd, modern County Antrim) between these two rivals at which Fiachnae mac Demmáin was
the victor and Fiachnae mac Baetan was slain.
The annals say the battle was fought by him which implies he was the aggressor.
He now becomes King of Ulaid but was himself defeated and slain by the King of Dalriada, Connad Cerr at the Battle of Ard Corainn in 627.
The "Annals of Clonmacnoise" claim that this was in revenge for the slaying of Fiachnae mac Baetan.
His wives were:
Cumne Dub, daughter of Furudrán mac Béicce of the Uí Tuirtri.
She was the mother of Dúnchad mac Fiachnai
(died circa 644),a king of Ulaid and of a daughter Dub Lacha who married Mongán mac Fiachnai (died 625), the son of his rival Fiachnae mac Baetan.
Cumne(Cummíne
) Find, daughter of Báetán Cáech of DalnAraide and sister of Fiachnae mac Baetan.
She was the mother of Máel Cobo mac Fiachnae (died 647), a king of Ulaid and a son named Suibne.
He was ancestor of all later Dal Fiatach kings.6
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.
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
Demmán mac Cairell
Demmán mac Cairill (died 572) was a king of the Dál Fiatach, and over-king of Ulaid in Ireland.
He was the son of Cairell mac Muiredaig Muinderg (died 532), a previous Ulaid king and brother of Báetán mac Cairill (died 581).
He ruled the Dál Fiatach and Ulaid from 557 to 572.
Máel Cobo mac Fiachnai
Máel Cobo mac Fiachnai( died 647) was a Dal Fiatach king of Ulaid.
He was the son of Fiachnae mac Demmáin( died 627) and half- brother of Dúnchad mac Fiachnai( died c. 644), previous kings.
He ruled from c. 644-647.
The Dal Fiatach recovered the overlordship of Ulaid after the death of Congal Cáech at the Battle of Mag Roth in 637 and were to retain it until 674.
Family strife was a common theme among the dynasty at this time.
Máel Cobo was himself killed or slain by his nephew Congal Cennfota mac Dúnchada( died 674) in 647.
His sons were Blathmac mac Máele Cobo( died 670), a king of Ulaid and Óengus whose grandson Cathal mac Muiredaig was ancestor of the Leth Cathail sept of the Dal Fiatach.
Dúnchad mac Fiachnai
Dúnchad mac Fiachnai( died c. 644) was King of Ulaid from the Dal Fiatach dynasty.
He was the son of Fiachnae mac Demmáin( died 627), a previous king.
He ruled from 637 – c .644.
The Dal Fiatach recovered the kingship of Ulaid after the Battle of Mag Roth in 637 and were to retain it until 674.
Family strife was a common theme among the dynasty at this time.
Dúnchad's mother was Cumne Dub ingen Furudráin of the Uí Tuirtri( a tribe of the Airgialla west of Lough Neagh in modern County Tyrone).
She had previously been married to Dúnchad's great uncle Baetan mac Cairill( died 581) by whom she had children.
These children were eliminated by Dúnchad's full brother Máel Dúin mac Fiachnai in 605.
However, the ambitions of Máel Dúin were not to be fulfilled as he was murdered by Dúnchad at Óenach Deiscirt Maige, probably in southern Muirthemne in modern County Louth.
His son Congal Cennfota mac Dúnchada( died 674) was also a King of Ulaid.

Question: Who is Fiachnae Mac Demmáin's paternal grandfather?