William Busac, Count of Soissons

William Busac (1020-1076), son of William I, Count of Eu, and his wife Lesceline. Count of Eu, Count of Soissons, de jure uxoris. William was given the nickname Busac by the medieval chronicler Robert of Torigni.

William inherited his father’s countship and was Count of Eu when he rebelled against then duke William and was dislodged from his fortress of Eu, stripped of his county and forced into exile around 1050. The county of Eu then passed to William’s brother Robert.

William appealed to King Henry I of France, who gave him in marriage Adelaide, the heiress of the county of Soissons. Adelaide was daughter of Renaud I, Count of Soissons, and Grand Master of the Hotel de France. William then became Count of Soissons in right of his wife. William and Adelaide had four children:

William was succeeded by his brother Robert as Count of Eu. His son Renaud became Count of Soissons upon William’s death, and he was succeeded by his brother John.

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