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.
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.
Angelina of Serbia
Angelina Branković (ca. 1440–1520), née Arianiti, was the despotess consort of Serbian Despot Stefan Branković (r. 1458—1459), and a daughter of Albanian nobleman Gjergj Arianiti.
For her pious life she was proclaimed a saint and venerated as such by the Serbian Orthodox Church as Venerable Mother Angelina (/"Prepodobna mati Angelina").
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Maria of Serbia, Marchioness of Montferrat
Maria of Serbia or Marija Branković (b. 1466 - d. 27 August 1495) was princess of Serbia by birth, and marchioness of Montferrat by marriage.
She was daughter of despot Stefan Branković of Serbia and princess Angelina Arianiti of Albania.
In 1485, she married Boniface III, Marquess of Montferrat.

Question: Who is the maternal grandfather of Maria Of Serbia, Marchioness Of Montferrat?
Answer: Gjergj Arianiti