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