Since their formation as islands of Po river, Mezzano Inferiore and Superiore where possession of Parma's Bishop. Some ancient documents talk about alluvial lands near river Po owned from the Bishop after concession of Holy Roman Emperors Charles III the Fat in 973 and Henry VI in 1195. Abbot Giovanni Romani mentioned an event which happened near the ""Mezzano del Vescovo"" in 1131. The above-mentioned centres originated in different periods: the first one was Mezzano Superiore, the other certainly after 1306.