William IX, Count of Poitiers

Not to be confused with William IX, Duke of Aquitaine.
William IX
Count of Poitiers
Reign 17 August 1153 – April 1156
Born (1153-08-17)17 August 1153
Normandy, France
Died April 1156 (aged 2)
Wallingford Castle, Berkshire
Burial Reading Abbey, Berkshire
House Plantagenet / Angevin[nb 1]
Father Henry II of England
Mother Eleanor of Aquitaine

William (17 August 1153 – April 1156) was the first son of Henry II, King of England and Eleanor of Aquitaine.[1] He was born in Normandy on the same day that his father's rival, Eustace IV of Boulogne, died.

He died in April 1156, aged three. This was due to a seizure at Wallingford Castle, and he was buried in Reading Abbey at the feet of his great-grandfather Henry I.

At the time of his death, he was reigning as Count of Poitiers, as his mother had ceded the county to him. 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 duchy. Some authorities say he also held the title of "Archbishop of York", but this is probably an error. His half-brother Geoffrey (died 1212), who was born a year before William, did later hold that office, causing the confusion.


William IX, Count of Poitiers
Born: 17 August 1153 Died: April 1156
Regnal titles
Preceded by
Henry and Eleanor
Count of Poitiers
Succeeded by
Henry and Eleanor


  1. Historians are divided in their use of the terms "Plantagenet" and "Angevin" in regards to Henry II and his sons. Some class Henry II to be the first Plantagenet King of England; others refer to Henry, Richard and John as the Angevin dynasty, and consider Henry III to be the first Plantagenet ruler.


  1. Ymagines Historiarum, Chronicæ Sancti Albini

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