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Origin and history

The Châtelet du Crédoz, also known as Châtelet de Crêt d'Ot, is a former 13th century castle located in Cornier, Haute-Savoie. Its ruins, perched on an isolated rock at 509 meters above sea level, dominate the Rocailles plain between Reignier and La Roche-sur-Foron. This strategic site controlled the route between La Roche and Bonne, as well as the passage of the Arve, strengthening its military and logistical role in the Middle Ages.

The castle was first mentioned in 1225 in an arbitral award between William II of Geneva and Aymon II of Faucigny. Originally linked to the lords of Faucigny or the Counts of Geneva, he became a Savoyard possession after dynasty exchanges. In the 13th century, Peter II of Savoy strengthened it, adding a circular dungeon around 1260. The site then houses war machines such as balists, serving as a base for regional headquarters (Monthoux, Allinges, etc.).

Between the 13th and 15th centuries, the Châtelet du Crédoz was the seat of a castle of the Faucigny, comprising seven villages (Arenthon, Boringe, etc.). Its decline began after 1355, with the annexation of the Faucigny and the loss of its strategic interest. In the 15th century, it passed into the hands of the Viry, Savoie-Genevois, and then Nemours families, before being bequeathed to the Granery in 1682. Abandoned, he fell into ruin, keeping only his enclosures and dungeon.

Architecturally, the castle consists of a fossilized triangular enclosure, with two square towers and a circular dungeon of 7.68 meters in diameter, with thick walls of 2.80 meters. A courtine connects the towers, while a castral village spread at its feet, protected by a water-powered enclosure. The term "chestlet" here refers to a surveillance fortification, distinct from residential castles.

Toponymically, the site is called Crêt-d'Ot, Crêt-d'Ost or Credoz, evoking a military gathering place ("ost"). Medieval sources also mention the forms Castelleti of Credo or Credo. Its history reflects the conflicts between Geneva, Faucigny and Savoy, as well as the evolution of defence and administrative systems from the Middle Ages to the modern era.

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