The parish is placed under the protection of Sant’Orso, a priest from Aosta Valley who lived between the 7th and 8th century. Popular tradition affirms that he is said to have been the saint who reclaimed the area, which was originally uninhabitable. The canons of the Aosta collegiate of Sant’Orso may have played an important role in this sense, the parish seems to have been managed by them already in 1884. The canons held the parish until 1820, the year in which all rights were transferred to the bishop.

In 1642 the building took on its current appearance, following the extension works. The bell tower was built in 1840, after the old one was knocked due to problems relating to height and stability. The church has a regular shape. The interior, which has a single nave, redecorated by Pirlato in 1960, conserves precious altars from the eighteenth century in gilded sculpted wood, with Solomonic columns.