The town takes its name from Hilarius, who was bishop of Poitiers in the 4th century and master of St. Martin (evangelist of Gaul). Foissac was the original name of the parish.
The first reference to the parish in the texts date from the late 13th century (1270).
The village is nestled in a fold of land east of the road that connects to Égletons Lapleau.
The church nave and flat bed (twelfth century) was enlarged by the creation of side chapels in the 14th century (the cure is secular at that time, the church depended before the College of Canons of Tulle). Half-columns carried by consoles representative head of cattle disappeared reflect the vaulting of the building now beautifully structured. The capitals are carved some historiated (representation of defects). The top of the tower was rebuilt in 1747. The church has a reliquary monstrance in gilt brass pedicle from the early 14th century, a confessional from 1800 and a beautiful altarpiece representing the Calvary and the 17th century. The shrine of the 13th century has angels in medallions and is maintained, among other treasures, wrought in gold and enamel limousine, in the church of Lapleau.
Beside the church is the former rectory, including access to the courtyard is through an arched stone doorway. The large square which, until 1930, was the cemetery is surrounded by houses.
