Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
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.
Louis the Younger
Louis the Younger (830/835 – 20 January 882), sometimes Louis III, was the second eldest of the three sons of Louis the German and Emma.
He succeeded his father as the King of Saxony on 28 August 876 and his elder brother Carloman as King of Bavaria from 880 to 882.
He died in 882 and was succeeded in all his territories, which encompassed most of East Francia, by his younger brother, Charles the Fat, already king of Italy and emperor.
Marie-Anne Gaboury
Marie-Anne Lagimodière (née Gaboury; 15 August 1780 – 14 December 1875) was a French-Canadian woman noted as both the grandmother of Louis Riel, and as the first woman of European descent to travel to and settle in what is now Western Canada.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Louis the German
Louis the German (c. 806/810 – 28 August 876), also known as Louis II, was the first king of East Francia, and ruled from 843876 AD.
Grandson of emperor Charlemagne and the third son of Louis the Pious, emperor of Francia, and his first wife, Ermengarde of Hesbaye, he received the appellation "Germanicus" shortly after his death in recognition of Magna Germania of the Roman Empire, reflecting the Carolingian's assertions that they were the rightful descendants of the Roman Empire.
After protracted clashes with his father and his brothers, Louis received the East Frankish Empire in the 843 Treaty of Verdun.
His attempts to conquer the West Frankish Empire of his half-brother Charles the Bald in 858–59 were unsuccessful.
The 860s were marked by a severe crisis, with the East Frankish rebellions of the sons, as well as struggles to maintain supremacy over his realm.
In the Treaty of Meerssen he acquired Lotharingia for the East Frankish Empire in 870.
On the other hand, he tried and failed to claim both the title of Emperor and Italy.
In the East, Louis was able to reach a longer-term peace agreement in 874 after decades of conflict with the Moravians.
Due to a decline in the written form in administration and government, Louis' reign predates Ottonian times.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
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.
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.
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.

Question: Who is Louis The Younger's paternal grandmother?
Answer: Ermengarde of Hesbaye