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).
Maria of Aragon, Queen of Castile
Maria of Aragon  was the Queen consort of Castile and Leon as the wife of John II of Castile.
She was the daughter of Ferdinand I of Aragon and Eleanor of Alburquerque.
Sir Thomas Green
Sir Thomas Green( c.1461 – 9 November 1506) was a member of the English gentry who died in the Tower of London, where he had been imprisoned for treason.
He is best known as the grandfather of Catherine Parr, last wife of King Henry VIII.
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.
Catherine, Princess of Asturias
Catherine of Castile (Castilian: "Catalina de Castilla"; 5 October 1422 - 17 September 1424) was "suo jure" Princess of Asturias and heiress presumptive to the Castilian throne all her life.
Catherine was born on 5 October 1422 in Illescas, Toledo.
She was the first child of King John II of Castile and his first wife, Maria of Aragon.
Named after her aunt and grandmother, the Duchess of Villena and Catherine of Lancaster, she immediately became heiress presumptive to the throne of Castile upon her birth.
The Infanta was formally recognised as successor to the throne of the kingdom and sworn in as Princess of Asturias on 1 January 1423 by the Cortes of Toledo.
However, the Princess of Asturias did not live long enough to succeed her father as Queen of Castile.
She died in Madrigal de las Altas Torres on 17 September 1424.
Her younger sister, Infanta Eleanor, replaced her as heiress and Princess of Asturias.
Princess Catherine is buried in Miraflores Charterhouse, along with her father and stepmother, Isabella of Portugal.
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.
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 maternal grandfather of Catherine, Princess Of Asturias?
Answer: Ferdinand I