Castello di Nus, Medieval castle in Nus, Italy.

Castello di Nus, also called château de Plane, stands on a promontory northwest of the Plane hamlet in Nus, guarding the Saint-Barthélemy valley. Its present form dates largely to 1595, when rebuilding after a fire joined the original body to a circular tower. The plan is T-shaped, with a ruined southern facade retaining a cross window and a courtyard where a bread oven and fountain were once shared.

The castle is first documented on 22 October 1287, when Guillaume de Nus was enfeoffed with it by the Count of Savoy; its stones suggest an earlier origin. In 1310 a partition act between the brothers Jean and Alexandre de Nus lists the kitchen, halls, stables, oven, keep, courtyard fountain and Saint-Michel chapel. The present form dates to rebuilding after a fire, with 1595 carved on the courtyard architrave.

The castle is still inhabited and opens only on special occasions, such as the FAI open days. Its name recalls the lords of Nus, who held it as vassals of the counts of Savoy from 1287; the hamlet below is called Plane. A chapel dedicated to Saint Michael stood by the castle and long went without services.

This property remains privately owned and is not open to the public, so enquire locally about current conditions before visiting. The best views of the building can be had from the road below or from nearby walking paths.

The quadrangular tower, similar to those of 11th- and 12th-century Aosta Valley castles, stood until the early 20th century before collapsing; the eastern wing had already largely fallen by then. A 1310 partition act between the brothers Jean and Alexandre de Nus lists the oven, still visible today, the courtyard fountain and the chapel of Saint Michael as shared property.