Anne of Austria, Duchess of Bavaria
Anna of Austria( 1318–1343) was the youngest daughter of Frederick the Fair, of Austria and his wife, Isabella of Aragon.
Her paternal grandparents were Albert I of Germany and Elisabeth of Tirol.
Her maternal grandparents were James II of Aragon and Blanche of Anjou.
Isabella of Aragon, Countess of Urgell
Isabella of Aragon( 1376, Barcelona – 1424) was a daughter of Peter IV of Aragon and his fourth wife, Sibila of Fortia.
She was infanta of Aragon and Countess of Urgel.
Isabella of France, Dauphine of Viennois
" For other persons named Isabella of France, see Isabella of France( disambiguation)" Isabella of France and Burgundy( 1310 – April 1348) was the daughter of Philip V of France and Joan II, Countess of Burgundy.
Isabella of Aragon, Queen of Germany
Isabella of Aragon (1305 – 12 July 1330) was the daughter of James II of Aragon and his second wife Blanche of Anjou.
Queen consort of Frederick I of Austria.
She was a member of the House of Aragon
Sancho of Aragon (archbishop of Toledo)
Sancho of Aragon (1250 – Martos, 1275) was an Infante of Aragon and Archbishop of Toledo, who was killed by the Moors.
Joanna of Aragon, Countess of Ampurias
Joanna of Aragon( Barcelona 7 November 1344- Castellón, Ampurias 1385) was the second child of Peter IV of Aragon and his first wife Maria of Navarre.
She was an Infanta of Aragon by birth and Countess of Ampurias by her marriage.
She was a member of the House of Aragon.
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.
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.
James II of Aragon
James II (10 April 1267 – 2 or 5 November 1327), called the Just, was the King of Aragon and Valencia and Count of Barcelona from 1291 to 1327.
He was also the King of Sicily (as James I) from 1285 to 1295 and the King of Majorca from 1291 to 1298.
From 1297 he was nominally the King of Sardinia and Corsica, but he only acquired the island of Sardinia by conquest in 1324.
His full title for the last three decades of his reign was "James, by the grace of God, king of Aragon, Valencia, Sardinia and Corsica, and count of Barcelona"
(Latin: "Iacobus Dei gracia rex Aragonum, Valencie, Sardinie, et Corsice
ac comes Barchinone").
Born at Valencia, James was the second son of Peter III of Aragon and Constance of Sicily.
He succeeded his father in Sicily in 1285 and his elder brother Alfonso III in Aragon and the other Spanish territories, including Majorca, in 1291.
He was forced to cede Sicily to the papacy in 1295, after which it was seized by his younger brother, Frederick III, in 1296.
In 1298 he returned Majorca to the deposed king of Majorca, a different James II, having received rights to Sardinia and Corsica from Pope Boniface VIII.
On 20 January 1296, Boniface issued the bull "Redemptor mundi" granting James the titles of Standard-bearer, Captain General and Admiral of the Roman church.
Tahira Wasti
Tahira Wasti( 1944 – March 11, 2012) was a well- known Pakistani writer and television actress.
She is best known for portrayal of Isabella of Castile in the TV drama" Shaheen".

Question: Who is the paternal grandfather of Isabella Of Aragon, Queen Of Germany?
Answer: Peter III of Aragon