 The chapel of S. Peter was promoted into being a parish church ("plebes", "piave") c. 996–999 by Pope Gregory V. In 1101 Countess Matilda of Tuscany bestowed liberty upon the church of Guastalla.On 21 October 1106, Pope Paschal II held a council in Guastalla of bishops from France, Germany and Italy.He declared that, since the See of Ravenna had so frequently opposed the leadership of the Church of Rome, the dioceses of Parma, Reggio, Modena, and Bologna should never thereafter be subject to Ravenna as their metropolitan.