William IX, Count of Poitiers

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William (August 17, 1153 – April 1156) was the first child of Henry Plantagenet (later Henry II of England) and Eleanor of Aquitaine, born in Normandy, on the same day that his father's rival Eustace IV of Boulogne died.

William was a younger maternal half-brother of Marie de Champagne and Alix of France. He was an older brother of Henry the Young King, Matilda of England, Richard I of England, Geoffrey II, Duke of Brittany, Leonora of Aquitaine , Joan Plantagenet and John of England.

He died aged two years at Wallingford Castle, and was buried in Reading Abbey at the feet of his great-grandfather Henry I.

At the time of his death, he had already been given the title of Count of Poitiers. For centuries, the dukes of Aquitaine had held this as one of their minor titles, so it had passed to Eleanor from her father; giving it to her son was effectively a revival of the title, separating it from the dukedom. Some authorities say he also held the title of "Archbishop of York", but this is probably an error. His bastard half-brother Geoffrey Plantagenet (d. 1212), who was born within months of William, did later hold that office, causing the confusion.


William IX, Count of Poitiers
Born: 17 August 1153 Died: April 1156
English royalty
Preceded by
Henry, Duke of Anjou
Heir to the English Throne
as heir apparent

25 October, 1154 - April, 1156
Succeeded by
Henry the Young King
French nobility
Preceded by
Henry and Eleanor
Count of Poitiers
1153 – 1156
Succeeded by
Family information
Geoffrey V of Anjou
House of Anjou
Henry II of England William IX, Count of Poitiers
Matilda of England
House of Normandy
William X of Aquitaine
House of Poitiers
Duchess of Aquitaine
Aenor de Châtellerault
Notes and references
1. Tompsett, Brian, Directory of Royal Genealogical Data (Hull, UK: University of Hull, 2005).
2. Ross, Kelley L., The Proceedings of the Friesian School (Los Angeles, US: Los Angeles Valley College, 2007).