The first evidence of the existence of the castle dates back to the thirteenth century, a simple construction consisting of a single block of masonry with a rectangular plan, in all probability surrounded by walls.
In the 14th century the castle passed into the hands of the Challants, the main noble family of the Aosta Valley, linked to the Savoy family. At the end of the fourteenth century with Aimone di Challant the castle undergoes transformations and appears to have three floors above ground and a basement. The keep, or donjon, a massive body that represented the best defended part of the castle, is considerably enlarged towards the west.
At the time of Amédée de Challant, the castle, enriched with four corner towers and a double wall, appears to be a complex structure with multiple functions: a stately home and at the same time a defensive fortress, a place of representation, generally used for hospitality of illustrious guests and for the administration of justice, the management center of an important agricultural plot.
At the end of the 15th century the top floor was built, the towers were raised and corbels, machicolations and battlements were inserted in the upper part of the structure. In 1565 the castle passed into the hands of a Trentino family, the Madruzzo, linked to the Valdostan lords through the marriage of Isabelle de Challant with Giovanni Federico Madruzzo, and then returned to the Challant heritage at the end of the 1600s. A large reconstructive campaign dates back to the time of Joseph-Félix de Challant when, between 1713 and 1728, the spaces between the four corner towers are joined by the loggias, decorated with elegant stucco elements, and the internal rooms of the house are remarkably transformed. The creation of the terraced park and the construction of the steep driveway on the southern side, the two-flight staircase in front of the main entrance and the fountain help to give the castle the appearance of a modern stately home surrounded by greenery. while that of the medieval defensive fortress is completely lost.
During the nineteenth and twentieth centuries, following the various changes of ownership following the extinction of the Challants (Maria Teresa di Challant died in 1837; her son Vittorio Cacherano della Rocca in 1857), the castle underwent numerous internal alterations, linked to its used as a summer resort by Piedmontese and Ligurian families.
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