The Château de Keriolet is a castle built in the 19th century in Concarneau (France).

[1] At the end of 1850s, under the Second French Empire, Louis Charles Honoré de Chauveau (1829-1889) met the Russian princess Zénaïde Yusupov.

He had bequeathed the domain to his sister, Madame Emma Prieur, or to his mistress Jeanne Ducos, with whom he had two children, depending on the source.

Whatever the case, Zénaïde bought back Kériolet for 1,5 million francs and decided then to donate it, with her lands and her collections, to the department of Finistère.

In 1956, Felix Yusupov won a lawsuit and regained possession of the castle from the department of Finistère.