Vermandois
Sign in to savethumb|240px|Vermandois in the possession of the House of Valois-Burgundy, from 1435 to 1477 (southernmost county on map) thumb|Porte St-Jean
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thumb|240px|Vermandois in the possession of the House of Valois-Burgundy, from 1435 to 1477 (southernmost county on map) thumb|Porte St-Jean
Vermandois () was a French county that appeared in the Merovingian period. Its name derives from that of an ancient tribe, the Viromandui. In the 10th 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.