The construction of the Constantine Church dates back to the Middle Ages, before the founding of the Swiss Confederation. At that period, well before the Reformation, it was a Catholic church in the Roman style. At that time the church depended on the diocese of Sion, owner of the estate where the building stands, before it was sold to Pierre of Savoy, member of the famous and noble family. Before the Reformation, the Constantine Church was dedicated to Saint Martin, a Hungarian soldier in the Roman army who became a monk and then finally a bishop. From its Catholic period, the holy place keeps a small, round stained glass window dating from the 14th Century representing Christ on the cross with John and Mary. In 2001, it was joined by three modern stained glass windows created by an artist of the region.
