 On the same road, it was built a small castle (nonexistent today, replaced by a recent private villa), who gave built to the current namesake hamlet.In the 16th century, the country came under the territory of the dukes Gonzaga, until the 18th century, when they were deposed.Since 1709, Conzano was annexed to the Duchy of Savoy, under direct control of the Casale Monferrato district before, the Marengo department during the Napoleonic occupation.