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.
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.
Faustina the Younger
Annia Galeria Faustina Minor ("Minor" is Latin for "the Younger"), Faustina Minor or Faustina the Younger (born probably 21 September CE, — 175/176 CE)
was a daughter of Roman Emperor Antoninus Pius and Roman Empress Faustina the Elder.
She was a Roman Empress and wife to her maternal cousin Roman Emperor Marcus Aurelius.
She was held in high esteem by soldiers and her own husband and was given divine honours after her death.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Lucilla
Annia Aurelia Galeria Lucilla or Lucilla (March 7, 148 or 150 – 182) was the second daughter and third child of Roman Emperor Marcus Aurelius and Roman Empress Faustina the Younger.
She was the wife of her father's co-ruler Lucius Verus and an elder sister to later Emperor Commodus.
Commodus ordered Lucilla's execution after a failed assassination and coup attempt when she was about 33 years old.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
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 Lucilla's maternal grandfather?
Answer: Antoninus Pius