The Saint-Pierre church is a building of Romance style built starting from the XI century, in the site of an old sanctuary mérovingien. Built on a plan in Latin cross, it is composed by a nave framed since the collapse of cross the warheads which covered it, a prolonged transept of two absidioles arched in half dome and an apse where the you can still distinguish from the traces of frescos. These paintings, relatively rare in the area, represent a Christ in majesty, undoubtedly painted in the neighbourhoods of the XII century, as well as the funerary liter of one of the lords of Mornac, painted a little more tardily, in the XVII century. The square of the transept is equipped of a cupola on pendentive, itself surmounted by a square bell-tower, according to a model which is rather frequently found in the churches saintongeaises. The bell-tower, from Romance origin, was modified considerably at the time of the war of hundred-years, giving him the almost military character qu' aujourd' is known to him; today. It was restored in 1850 by the Viaud architect, bench with Marennes.
In 1951, excavations took place in the sanctuary, which let appear the substructions of the old church préromane, in particular a pentagonal bedside, but these vestiges are not apparent any more today. Sarcophagi mérovingiens, remainders of the cemetery which surrounded the old church, are on the other hand always visible in front of the bedside of the building. The chorus and the transept were classified historic buildings in 1913 and 1948. The nave is registered with the additional inventory of the historic buildings since 1952.