Hiltrud
Hiltrud (born c. 716 died 754), was a Duchess consort of Bavaria.
She was regent of Bavaria for her minor son in 748-754.
She was a daughter of Charles Martel and Rotrude of Treves.
She married Odilo I of Bavaria.
After his death in 748, she became regent for her son Tassilo.
She died in 754, when the boy turned 13.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
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.
Charles Martel
Charles Martel (688 – 22 October 741) was a Frankish statesman and military leader who, as Duke and Prince of the Franks and Mayor of the Palace, was the "de facto" ruler of Francia from 718 until his death.
He was a son of the Frankish statesman Pepin of Herstal and Pepin's mistress, a noblewoman named Alpaida.
Charles successfully asserted his claims to power as successor to his father as the power behind the throne in Frankish politics.
Continuing and building on his father's work, he restored centralized government in Francia and began the series of military campaigns that re-established the Franks as the undisputed masters of all Gaul.
According to a near-contemporary source, the "Liber Historiae Francorum", Charles was "a warrior who was uncommonly  effective in battle".
Much attention has been paid to his success in defeating an Arab invasion in Aquitaine at the Battle of Tours.
Alongside his military endeavours, Charles has been traditionally credited with a seminal role in the development of the Frankish system of feudalism.
At the end of his reign, Charles divided Francia between his sons, Carloman and Pepin.
The latter became the first king of the Carolingian dynasty.
Charles' grandson, Charlemagne, extended the Frankish realms, and became the first emperor in the West since the fall of Rome.
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.
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.
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).

Question: Who is Hiltrud's paternal grandfather?
Answer: Pepin of Herstal