Adelaide, Countess of Vermandois

Adelaide of Vermandois (died 23 September 1120) was suo jure Countess of Vermandois and Valois from 1080 to 1120. She was the last landed ruler of the Carolingian dynasty.

Adelaide was the daughter of Herbert IV, Count of Vermandois and Adele of Valois.

By 1080, Adelaide married Hugh, son of the Capetian King Henry I of France and younger brother of Philip I of France. Hugh became Count of Vermandois, following Adelaide's father's death.

In 1104, Adelaide married Renaud II, Count of Clermont-en-Beauvaisis. By this marriage, Adelaide had a daughter, Margaret of Clermont.

In 1102, Adelaide was succeeded by her son, Ralph I. Adelaide died in 1120, being the last Carolingian to hold the County of Vermandois.

Issue
Adelaide and Hugh had:
 * Matilda, married Ralph I of Beaugency
 * Beatrice, married Hugh IV of Gournay
 * Elizabeth of Vermandois, Countess of Leicester, (died 1131) married, firstly, Robert de Beaumont, 1st Earl of Leicester and secondly, William de Warenne, 2nd Earl of Surrey
 * Ralph I, Count of Vermandois
 * Constance, married Godfrey de la Ferté-Gaucher
 * Agnes, married Boniface of Savone
 * Henry (died 1130), Lord of Chaumont en Vexin
 * Simon (died 1148), bishop of Noyon and Tournai
 * William

Adelaide and Renaud had:
 * Margaret of Clermont