Adelaide of Vermandois (died 23 Sep 1120) was suo jure Countess of Vermandois and Valois from 1080 to 1120. And 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) 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) William, possibly married to Isabella, daughter of Louis VI of France. Adelaide and Renaud had: