 Château-Neuf was the refuge of Charles II of England in 1650, after the execution of his father.During the Fronde, the French civil war in the mid-17th century, the ""Grande Mademoiselle"", Anne Marie Louise, Duchess of Montpensier, came to Saint-Germain seeking asylum and installed herself at Château-Neuf where "she lay in a wonderfully beautiful chamber in a ruined tower, well-gilded and large but with no glass in the windows and a meager fire.