Vermandois was a French county, that appears in the Merovingian period. In the tenth century, it was organised around two castellan domains: St Quentin (Aisne) and Péronne (Somme). In today's times, the Vermandois county would fall in the Picardy region of northern France.
Pepin I of Vermandois, the earliest of its hereditary counts, was descended in direct male line from the emperor Charlemagne. More famous was his grandson Herbert II (902–943), a man absolutely devoid of scruples, who considerably increased the territorial power of the house of Vermandois, and kept the lawful king of France, the unlucky Charles the Simple, prisoner for six years. Herbert II was son of Herbert I, lord of Péronne and St Quentin, who was killed in 902 by an assassin in the pay of Baldwin II, Count of Flanders. His successors, Albert I, Herbert III, Albert II, Otto and Herbert IV, were not as historically significant.
In 1077, the last count of the first house of Vermandois, Herbert IV, received the county of Valois through his wife. His son Eudes (II) the Insane was disinherited by the council of the Barons of France. He was lord of Saint-Simon through his wife, and the county was given to his sister Adela, whose first husband was Hugh the Great, the brother of King Philip I of France. Hugh was one of the leaders of the First Crusade, and died in 1102 at Tarsus in Cilicia. The eldest son of Hugh and Adela was count Raoul I (c. 1120-1152), who married Petronilla of Aquitaine, sister of the queen, Eleanor, and had by her three children: Raoul (Rudolph) II, the Leper (count from 1152-1167); Isabelle, who possessed from 1167 to 1183 the counties of Vermandois, Valois and Amiens conjointly with her husband, Philip, Count of Flanders; and Eleanor. By the terms of a treaty concluded in 1186 with the king, Philip Augustus, the count of Flanders kept the county of Vermandois until his death, in 1191. At this date, a new arrangement gave Eleanor (d. 1213) a life interest in the eastern part of Vermandois, together with the title of countess of St Quentin, and the king entered immediately into possession of Peronne and its dependencies.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press
- Anselme, "Histoire Genealogique de la Maison royale de France", 1726.
- M.Fouquier-Cholet, "Histoire des Comtes héréditaires du Vermandois", Saint-Quentin, 1832.
- Ioh.Mabillon, "Annales ord. Sancti Benedicti. Ticinense". Lucae, 1739.
- Louis Moreri, "Le Gran Dictionnaire Historique", Paris, 1743-1749.
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