William of Montferrat, Count of Jaffa and Ascalon
William of Montferrat (early 1140s – 1177), also called William Longsword (modern Italian "Guglielmo Lungaspada"; original Occitan "Guilhem Longa-Espia"), was the Count of Jaffa and Ascalon, the eldest son of William V, Marquess of Montferrat and Judith of Babenberg.
He was the older brother of Conrad, Boniface, Azalaïs, and Renier, and a cousin of both Frederick I, Holy Roman Emperor and Louis VII of France.
The earliest surviving mention of William's epithet, "Longsword", said to refer to his military abilities, and differentiating him from his father, known as "William the Elder", is in the song "
En abril, quan vei verdeyar", composed in late 1176-early 1177 by the troubadour Peire Bremon lo Tort:
It was rendered into Latin as Longaspata by William of Tyre in his "Historia rerum in partibus transmarinis gestarum"
(written in the early 1180s), whence
it has been taken up by historians.
Despite his eligibility as the eldest son of one of the greatest magnates in northern Italy, with many royal and imperial connections and the fair good looks of his family, he did not marry until he was well into his thirties.
In 1167, his father had tried to arrange marriages for him and Conrad to daughters of Henry II of England or sisters of William I of Scotland - but these failed, the English match probably because of consanguinity (the boy's mother Judith was related to Eleanor of Aquitaine), the Scottish match because the princesses were already married.
In 1176 William was chosen by Raymond III, count of Tripoli, and Baldwin IV, king of Jerusalem, to marry Baldwin's sister Sibylla.
William also gained the County of Jaffa and Ascalon in the marriage.
William of Tyre describes him as tall, blond, and handsome; brave, frank and unpretentious, but inclined to eat and drink copiously, though not to the impairment of his judgment.
With the King's consent, William and Reynald of Châtillon gave a grant of land to the new Castilian military order, the Order of Montjoie, commanded by Count Rodrigo Alvarez de Sarria.
However, William's activities in Outremer were cut short.
He fell ill, probably from malaria, at Ascalon in April 1177, and died there in June, leaving Sibylla pregnant with the future king Baldwin V.
His body was taken to Jerusalem and buried at the Hospital of St John.
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Sibylla, Queen of Jerusalem
Sibylla (French: "Sibylle", c. 1160–1190) was the Countess of Jaffa and Ascalon from 1176 and Queen of Jerusalem from 1186 to 1190.
She was the eldest daughter of Amalric I of Jerusalem and Agnes of Courtenay, sister of Baldwin IV and half-sister of Isabella I of Jerusalem, and mother of Baldwin V of Jerusalem.
Her grandmother Melisende had provided an example of successful rule by a queen regnant earlier in the century.
Priscilla Pointer
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She began her career in the theater, including productions on Broadway.
Later, Pointer moved to Hollywood to act in films and on television.
She is the mother of Amy Irving, therefore making her the former mother- in- law of filmmakers Steven Spielberg and Bruno Barreto and the mother- in- law of documentary filmmaker Kenneth Bowser, Jr.
Anne d'Alençon
Anne d'Alençon (Italian: Anna d'Alençon) (30 October 1492 – 18 October 1562), Lady of La Guerche, was a French noblewoman and a Marquise of Montferrat as the wife of William IX, Marquis of Montferrat.
She acted as Regent of the Marquisate of Montferrat for her son, Boniface from 1518 to his death in 1530.
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She was the mother- in- law of Edward J. Danziger and wrote a number of the screenplays for films by his company Danziger Productions.
Renier of Montferrat
Renier of Montferrat( in Italian, Ranieri di Monferrato)( 1162– 1183) was the fifth son of William V of Montferrat and Judith of Babenberg.
He became son-in- law of the Byzantine Emperor Manuel I Komnenos and" Caesar" in 1180, and was later murdered in a Byzantine power- struggle.
William of Æbelholt
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Rainier, Marquess of Montferrat
Rainier or Renier( c. 1084 – May 1135), son of William IV, Marquess of Montferrat, was the sixth ruler of the state of Montferrat in north- west Italy from about 1100 to his death, and the first such to be identified in contemporary documents as Margrave of Montferrat.

Question: Who is William Of Montferrat, Count Of Jaffa And Ascalon's mother-in-law?
Answer: Agnes of Courtenay