The Château de la Grange-Bléneau is a castle in the commune of Courpalay in the Seine-et-Marne département of France.
[1] Over the years, the castle has belonged to several families: Courtenay, Aubusson-La Feuillade and d'Aguesseau.
Ownership passed from Henriette d'Aguesseau to her daughter Adrienne de La Fayette.
She passed it on to her husband, General Gilbert du Motier, Marquis de Lafayette, who lived there from 1802 until his death in 1834.
Upon the death of his cousin in 1955, René de Chambrun discovered the large cache of documents in the attic, and he founded a private museum to Lafayette.