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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Princess Louise of Prussia (1770–1836)
Princess Frederica Dorothea "Louise" Philippine of Prussia (24 May 1770 - 7 December 1836) was a member of the House of Hohenzollern.
She was a niece of Frederick the Great, being the second daughter and third child of Prince Augustus Ferdinand of Prussia by his wife Margravine Elisabeth Louise of Brandenburg-Schwedt.
Louise and her husband Prince Antoni Radziwiłł were popular for their patronage of music, as well as their prominent positions in Berlin society.
Louise is also notable for being the mother of Elisabeth Radziwill, the childhood love of future German Emperor Wilhelm I, whose strong desire to marry her was thwarted out of considerations for Elisabeth's inequality of rank.
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.
Ferdynand Radziwiłł
Ferdynand Fryderyk Radziwiłł( 1834 in Berlin – 1926 in Rome) was a Polish nobleman and Polish- German politician.
He was the son of Bogusław Fryderyk Radziwiłł and Countess Leontyna von Clary und Aldringen.
Through his paternal grandmother, Princess Louise of Prussia, he was a cousin of Russian and German Emperors.
At the time Poland was partitioned, he lived in the German Empire, where he was a member of the German parliament( Reichstag) from 1874 to 1919.
He was known as an important leader of the Polish minority and opponent of the Germanization and Kulturkampf policies.
After Poland regained independence in 1918, he became a Polish citizen and a member of the Polish parliament( Sejm).
Son of: Bogusław Fryderyk Radziwiłł.
Father of: Janusz Franciszek Radziwiłł, Michał Radziwiłł Rudy, Karol Ferdynand Radziwiłł, Małgorzata.
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.
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).
Bogusław Fryderyk Radziwiłł
Bogusław Fryderyk Radziwiłł (3 January 1809 – 2 January 1873) was a Polish nobleman and Prussian military officer and politician.
At the time Poland was partitioned, he lived in the Kingdom of Prussia, where he was a member of the Prussian parliament (later, of the Prussian House of Lords).
He attained the rank of general within the Prussian Army.
His father, Prince Antoni Henryk Radziwiłł, was also the "Duke-Governor"  of the Grand Duchy of Poznań, an autonomous province of the Kingdom of Prussia.
His mother was Princess Louise of Prussia, and through her, he was great-grandson of King Frederick William I of Prussia, great-great-grandson of King George I of Great Britain, cousin of William I, German Emperor and Tsar Alexander II of Russia.
He was the father of Edmund Radziwiłł and Ferdynand Radziwiłł.
Radziwiłł was born in Königsberg and died in Berlin.

Question: Who is the maternal grandfather of Bogusław Fryderyk Radziwiłł?