Adelaide, Countess of Soissons

Adelaide (died 1105), was sovereign Countess of Soissons from 1057 until 1105.

She was the daughter of Renaud I, Count of Soissons, and his wife, whose name is unknown, widow of Hilduin III, Count of Montdidier. .

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:
 * Renaud II, Count of Soissons
 * John I, Count of Soissons, married to Aveline de Pierrefonds
 * Manasses of Soissons, Bishop of Cambrai, Bishop of Soissons
 * Lithuise de Blois, married to Milo I of Montlhéry
 * Daughter, name unknown, married to Yves le Vieux.

William Busac became Count of Soissons, de jure uxoris, upon their marriage.