Adelaide (died 1105), was sovereign Countess of Soissons from 1057 until 1105.
Adelaide became ruler of the County of Soissons upon the death of her father and brother, Guy II, Count of Soissons, in 1057.
Adelaide married William Busac, Count of Eu, grandson of Richard I, Duke of Normandy.
Adelaide and William had five children: William Busac became Count of Soissons, de jure uxoris, upon their marriage.
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