Verneuil-en-Halatte (French pronunciation: [vɛʁnœj ɑ̃.n‿alat], literally Verneuil in Halatte) is a commune in the Oise department in northern France.

The castle was finally sold to king Henry IV in 1599, who offered it to his mistress Catherine Henriette de Balzac d'Entragues, raising the grounds to a marquisate and thus making her the Marquise de Verneuil en Beauvoisis.

The grounds were raised again to a duchy-peerage by king Louis XIV of France in 1652, granting Henri the title of Duke of Verneuil.

His successor, Louis Henri, Duke of Bourbon, no longer made use of the castle, causing it to fall into decay.

Maintenance to the grounds was finally stopped in 1724 and the pillaging of the castle started around 1734, with stone being recovered for improving the Château de Chantilly.