Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Fergus mac Fogartaig
Fergus mac Fogartaig (died 751) (or Fergal) was King of South Brega of the Uí Chernaig sept of Lagore of the Síl nÁedo Sláine branch of the southern Ui Neill.
He was the son of the high king Fogartach mac Néill (died 724).
He ruled from 738 to 751.
The annals do not mention any events regarding him other than his death obit.
His death obit, though, in the "Annals of Ulster" has significance as the first time the title King of Southern Brega ("regis Deisceird Breg") is used.
His sons included Máel Dúin mac Fergusa (died 785) and Cernach mac Fergusa (died 805), both called Kings of Loch Gabor as well as Ailill mac Fergusa (died 800), styled King of South Brega.
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.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Ailill mac Fergusa
Ailill mac Fergusa( died 800) was King of South Brega of the Uí Chernaig sept of Lagore of the Síl n Áedo Sláine branch of the southern Ui Neill.
He was the son of Fergus mac Fogartaig( died 751) and brother of Máel Dúin mac Fergusa( died 785), previous kings.
he ruled from 797 to 800.
The annals record that he died from being thrown from a horse.
He is styled" rex Deisceirt Bregh"- King of South Brega.
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.
Fogartach mac Néill
Fogartach Mac'Artain (died 724), sometimes called Fogartach ua Cernaich, was an Irish king who is reckoned a High King of Ireland.
He belonged to the Uí Chernaig sept of the Síl nÁedo Sláine branch of the southern Uí Néill.
He was King of Brega and was the son of Niall mac Cernaig Sotal (died 701) and great-grandson of the high king Diarmait mac Áedo Sláine (died 665).
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.

Question: Who is the paternal grandfather of Fergus Mac Fogartaig?
Answer: Niall mac Cernaig Sotal