 The Roman influence was demonstrated thanks to the finding, during the construction of the local castle in the XII-XIV century, of a Roman votive altar dedicated to "Giove Ottimo Massimo", Jupiter; in fact, it was preserved intact in the walls of the ancient church that once stood where the castle was built.The siliceous stone was then donated in 1820 to the cathedral of Novara.Being a small enough decentralized settlement, Vaprio never experienced a large expansion.