The church of this parish, forming a priory of the order of St-Benoît and which came under the abbey of Baignes, was formerly dedicated, and from 1586, to St-Pierre, prince of the apostles, and its construction probably dated of the Roman era. In the 17th century, this church was rebuilt, in the form of a simple rectangle, by Philippe Fortain, Lord of Chamouillac and Louise de Péréfixe, his wife, and consecrated under the new invocation of the apostles St Jacques and St Philippe, whose feast takes place on May 1, by Jacques Raoul, bishop of Saintes, in 1644.
Church oriented. The cemetery that surrounded it no longer exists.
During the Revolution, the priest Ransanne, who had taken the oath, was not worried, but the sculptures of the front door were mutilated.
Rectangular plan church with a single nave and straight apse.
The nave, of great simplicity, is traversed on its periphery by a funerary "liter" with the coat of arms of the lord founder. It is covered by a plaster ceiling.
On the North wall and on the South wall, two arcades which form large “enfeux”. Above the arcature of the North wall, an inscription relating to the construction of the church: "Philippe Fortain and Péréfixe, his dear wife, who after having lived holy, died on March 30, 1693, founded and made build at their expense the present church and erected into a parish; which was consecrated in 1644, under the names of the apostles Saint-Jacques and Saint-Philippe".
On the arcature of the south wall, a motif from the 17th century.
Outside, the western facade is partly covered by a porch, a kind of canopy, called in the region "ballet". 17th century entrance door with pediment. Above the pediment, decapitated statue. Two crests, one bearing nine stars, the other a broken chevron and three stars. On each side, bust of the founders.
The high altar, placed at the bottom of the apse, is in wood, formerly carved; we see 2 standing holy figures, one of whom is armed with a 2-edged sword. There are also copper candlesticks.
At the sides of the altar, are 2 frames without inscription; the one on the right is longer than it is wide; the one on the left is almost square and decorated with designs in the form of arabesques.
The church of Chamouillac is not vaulted; it has a wooden ceiling. The bell tower, placed in the middle of the church, is built in structural parts and covered with slates; it contains a small bell weighing more than 100 kilos
Church classified as an historic monument on December 5, 1908.