Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Eilika of Schweinfurt
Eilika of Schweinfurt (c. 1005 – after 10 Dec 1059) was Duchess consort of Saxony.
She came from a Bavarian noble family as the daughter of Margrave Henry of Schweinfurt and Gerberga of Gleiberg (970 –
aft. 1036).
Around 1020, Eilika married Bernard II, Duke of Saxony and was mother of:
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Berthold of Schweinfurt
Berthold of Schweinfurt( died 15 January 980) was a German nobleman.
Gerberga of Gleiberg
Gerberga of Gleiberg (c. 970 –
aft. 1036) was a daughter of Herbert of Wetterau and Irmtrud of Avalgau (957 – 1020).
She married Henry of Schweinfurt and had the following children:
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.

Question: Who is Eilika Of Schweinfurt's maternal grandfather?
Answer: Herbert of Wetterau