Herbert IV of Vermandois (1028–1080) was Count of Vermandois. He was the son of Otto of Vermandois and Parvie (also known as Pavia or Patia).
Family and children
Herbert married Adele of Valois, daughter of Ralph IV of Valois and Adele of Bar-sur-Aube. They had the following children:
Adelaide, Countess of Vermandois (c. 1062 – 23 September 1120), who married first Hugh Magnus, son of Henry I of France and younger brother of Philip I of France, and secondly Renaud II of Clermont-Beauvaisis
Odo I of Saint-Simon (c. 1064 – after 1085)
Gerard (born 1066)
After his death in 1080, his son-in-law Hugh Magnus inherited the countships of Vermandois and Valois, ending the direct Carolingian (Herbertine) rule in the region that had continued since 818.