The museum is one of the various sites in the city which recall the link between Villers-Cotterêts and the Dumas family: the royal château François 1er, the Saint-Nicolas church, the town hall, the Hôtel de l'Épée, the Abbé-Grégoire college or the family house.

In this year the Alexandre Dumas Friends Society was created to support and develop the museum.

In 1952, the museum moved to a 19th century mansion that served as General Maunoury's headquarters during the First World War.

They bring together numerous portraits, personal objects, documents written by the Dumas family.

Numerous manuscripts by Dumas Père adorn the museum: travel accounts, drafts of novels, children's stories, his memoirs, etc.