Medieval county and duchy, northern France. It corresponds to the southeastern quarter of the modern département of Oise, with an adjacent portion of Aisne. It was under the Merovingian kings (c. 500–751) and their successors, the Carolingians, until it became a hereditary countship. In 1214 King Philip II Augustus annexed it to the royal domain. The duchy's last representative, Henry III, was succeeded in 1589 by the house of Bourbon. In 1790 it was abolished in the redivision of France into départements.

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