 Bishop Carlo Settala (1653–1682) presided over a synod held in Tortona on 22–24 April 1659; he held another on 12–14 September 1673.Bishop Carlo Francesco Ceva (1683–1700) held a synod on 13 May 1687; he held his second synod on 18–20 May 1699.On 10–12 September 1715, Bishop Giulio Resta (1701–1743) held a diocessan synod.