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.
Alfonso de Castilla y Molina
Alfonso de Castilla y Molina( 1286 in Valladolid – 1291 in Valladolid) was a Spanish noble in the service of the Kingdom of Castile.
He was an Infante de Castilla, son of King Sancho IV de Castilla, King of Castile and of his wife, the Queen María de Molina.
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.
Hernando de Aragón
Hernando de Aragón y de Gurrea, OCist( 25 July 1498 – 29 January 1575), Archbishop of Zaragoza and Lieutenant General of Aragon, was an Aragonese humanist and historian.
Sancho Alfonso, 1st Count of Alburquerque
Sancho Alfonso de Castilla( 1342–1374) is known in Spanish as" Don Sancho Alfonso de Castilla, Infante de Castilla, I conde de Alburquerque".
He was the ninth of the ten illegitimate children of King Alfonso XI of Castile and Lady Eleanor de Guzmán.
He was born in Seville.
He participated in a revolt of the Castilian nobles against the despotic rule of his brother, Pedro of Castile.
In 1373 he married Beatrice of Portugal, daughter of Peter I of Portugal and Inês de Castro.
They had two children: Fernando Sánchez, 2nd Count of Alburquerque, and Eleanor of Alburquerque, who married Ferdinand I of Aragon.
He also had an illegitimate daughter, Leonor Sánchez de Castilla, who married Fadrique de Castilla y Ponce de Leon, illegitimate son of Henry II, King of Castile.
Eleanor of Aragon, Countess of Toulouse
Eleanor of Aragon, Countess of Tolouse
(1182–1226) was a daughter of King Alfonso II of Aragon and Sancha of Castile, Queen of Aragon.
She married Raymond VI, Count of Toulouse.
Juan de Aragón y de Jonqueras, 2nd count of Ribagorza
Juan de Aragón y de Jonqueras, 2nd Count of Ribagorza,( 27 March 1457 in Benabarre, Spain – 5 July 1528 in Monzón, Spain) was a Viceroy of Naples( 1507 – 1509), replacing Gonzalo Fernández de Córdoba.
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.
Alfonso II of Aragon
Alfonso II (1–25 March 1157 – 25 April 1196), called the Chaste or the Troubadour, was the King of Aragon and, as Alfons I, the Count of Barcelona from 1164 until his death.
The eldest son of Count Ramon Berenguer IV of Barcelona and Queen Petronilla of Aragon, he was the first King of Aragon who was also Count of Barcelona.
He was also Count of Provence, which he conquered from Douce II, from 1166 until 1173, when he ceded it to his brother, Ramon Berenguer III.
His reign has been characterised by nationalistic and nostalgic Catalan historians, as "l'engrandiment occitànic" or "the Pyrenean unity": a great scheme to unite various lands on both sides of the Pyrenees under the rule of the House of Barcelona.

Question: Who is Eleanor Of Aragon, Countess Of Toulouse's paternal grandmother?
Answer: Petronilla of Aragon