The Berno Mill was built under the religious community Saint Gildas de Rhuys who exerted its power in the southern part of the main island. It is a tide mill and was, according to research built around the 13th century. There is no certainty to the exact date which it was built, the oldest document found concerning the mill was dating 1575. The mill kept functioning until 1910. Due to the lack of maintenance, the mill quickly degraded and became a ruin. On 28 November 1994, Jean Bulot, an Iledarais, created an association in order to restore the mill to its previous majestic state. Supported by a handful of volunteers, he managed to complete his project in June 2000.