Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Adolph IX, Count of Holstein-Kiel
Adolph IX, Count of Holstein- Kiel, also known as" Adolph VII",( – 26 January 1390) was count of Holstein- Kiel and Holstein- Plön from 1359 until his death.
John I, Duke of Cleves
John I, Duke of Cleves, Count of Mark( 16 February 1419 – 5 September 1481) was Duke of Cleves and Count of Mark.
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Frederick IX, Count of Hohenzollern
Friedrich IX, Count of Hohenzollern( d. between 1377 and 1379), nicknamed" Fredrick the Old" or" the Black Count", was a German nobleman.
He was the ruling count of Hohenzollern from 1339 until his death.
Dietrich IX, Count of Mark
Dietrich IX, Count of Mark (1374–1398) was the Count of Mark from 1393 until 1398.
Dietrich was the second son of Count Adolf III of the Marck and Margaret of Jülich.
His father had acquired the County of Cleves in 1368 and reserved this title for his eldest son Adolph to succeed him after his death.
Dietrich already received the title of Count of Mark in 1393, when his father was still alive.
When Dietrich fell in battle in 1398, he was succeeded by his elder brother Adolph, who had become Count of Cleves in 1394.
Thus the County of Mark and the County of Cleves were reunited again.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Margaret of Jülich
Margaret of Jülich (– 10 October 1425) was a daughter of Duke Gerhard VI of Jülich and his wife, Margaret of Ravensberg (1315-1389).
In 1369, she married Adolf III of the Marck.
She had fourteen children with him, at least five of whom did not survive infancy.

Question: Who is Dietrich Ix, Count Of Mark's maternal grandmother?
Answer: Margaret of Ravensberg