 By 1145 the Church of S. Peter at Guastalla was presided over by an Archpriest, as Pope Eugene III noted in his bull which took the Church of Guastalla under the protection of the Holy See.He also granted them the right to seek holy oils, consecrations and ordinations from whichever Catholic bishop they wished.The archive of the Archpriest of the Pieve of Guastalla was destroyed in 1557 as a casualty of war.