Paul the Jew
Paul the Jew was the Patriarch of Antioch, and head of the Greek Orthodox Church of Antioch, from 519 to 521.
Joanna of Hainaut
Joanna of Hainault( 1315–1374) was a Duchess of Jülich by marriage to William V, Duke of Jülich.
She was the third daughter of William I, Count of Hainaut, and Joanna of Valois.
She was a younger sister of Philippa of Hainault, Queen of England, and Margaret II of Hainault.
Philippa of Antioch
Philippa of Antioch (11481178) was the younger daughter of Constance, Princess of Antioch and her first husband Raymond of Poitiers.
She was Lady of Toron by her marriage to Humphrey II of Toron
and she was a mistress of Andronikos I Komnenos, who had seduced her while he was a guest at her stepfather's court.
Asclepiades of Antioch
Asclepiades of Antioch was Patriarch of Antioch and martyr.
He succeeded Serapion as Patriarch of Antioch in 211.
He was given the title of martyr, due to the trials he endured during Roman persecution.
Athanasius I Gammolo
Athanasius I Gammolo was the Patriarch of Antioch, and head of the Syriac Orthodox Church of Antioch from 595 until his death in 631.
Athanasius was also the author of" The Life of Severus of Antioch", a biography of the first Syriac Orthodox Patriarch of Antioch.
Raymond of Poitiers
Raymond of Poitiers (c. 1099- 29 June 1149) was Prince of Antioch from 1136 to 1149.
He was the younger son of William IX, Duke of Aquitaine and his wife Philippa, Countess of Toulouse, born in the very year that his father the Duke began his infamous liaison with Dangereuse de Chatelherault.
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.
Philippa of Luxembourg
Philippa of Luxembourg( 1252 – 6 April 1311) was the daughter of Count Henry V of Luxembourg and his wife, Marguerite of Bar.
She married John II, Count of Holland.
Two of her granddaughters were Philippa of Hainault, Queen consort of England, and Margaret II, Countess of Hainault in her own right and wife of Holy Roman Emperor Louis IV.
The children of John II of Holland and Philippa of Luxembourg included:
Theodosius VI of Antioch
Theodosius VI( Abourjaily) of Antioch was Greek Orthodox Patriarch of Antioch from 1958 to 1970.
John Falconet
John Falconet,( 1350–1400s) was an English nobleman, member of the Court of Philippa of Lancaster.

Question: Who is Philippa Of Antioch's paternal grandfather?
Answer: William IX