Background
Adelaide was the daughter of Herbert IV, Count of Vermandois, and Adele of Valois and of the Vexin.
Adelaide was the daughter of Herbert IV, Count of Vermandois, and Adele of Valois and of the Vexin.
Her brother was Eudes, Count of Vermandois (+ after 1085), married to Hedwig. Later became Lord of Saint-Simon by marriage. By this marriage she had nine children:
Matilda (fl 1110), married Ralph I of Beaugency
Beatrice (living 1144), married Hugh III of Gournay
Elizabeth of Vermandois, Countess of Leicester (d 1131)
Ralph I (d 1152)
Constance, married Godfrey de la Ferté-Gaucher
Agnes (living 1125), married Boniface of Savone
Henry (d 1130), Lord of Chaumont en Vexin
Simon (d 1148)
William, possibly married to Isabella, illegitimate daughter of King Louis VI of France
By this marriage she had one daughter, Margaret, who married Charles I, Count of Flanders.