The castle, stronghold of the Coskaër de Rosanbo family, then of the Le Peletier de Rosanbo, has been modeled with the wire of generations.

In the 14th century, is built a fortified castle on a strategic headland, located 4 miles from the Saint Michel-en-Grève bay in order to prevent the ascent of Bô by Scandinavian invaders.

In the 15th century, it is extended with a Gothic manor.

In the 17th century, is added a wing in view to create a closed courtyard.

That was done in the 19th century, with the last construction.

In the meantime, in the 18th century, Joubert architect created large windows and roofs in Mansart.