Baldwin of Ibelin, Seneschal of Cyprus
Baldwin of Ibelin (died 21 February 1267) was the fourth of five sons of John I of Beirut and his second wife Melisende of Arsuf.
He commanded the third "battaile" at the Battle of Agridi in 1232.
In 1246, he was appointed Seneschal of Cyprus and was taken captive at the Battle of Mansurah in 1250.
Baldwin married Alix, daughter of Walter III of Bethsan and Theodora Comnena Lathoumena.
She was called "la Seneschalece" and she gave him six children:
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Philip of Ibelin (died 1304)
Philip of Ibelin (died 1304) was constable of Cyprus.
He was son of Baldwin of Ibelin, Seneschal of Cyprus and Alix, daughter of Walter III of Bethsan and Theodora Comnena-Lathoumnena.
He married c. 1253 to Simone de Montbéliard, granddaughter of Walter of Montbéliard and had issue:
Gülbahar Hatun (wife of Mehmed II)
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Anne Denman
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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.
Diana Guardato
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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.
Mona Hopton Bell
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She was the grandmother of the painter Jean H. Bell.
Tjuyu
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She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.

Question: Who is Philip Of Ibelin (Died 1304)'s paternal grandmother?
Answer: Melisende of Arsuf