 Bergamo therefore had two cathedrals for several centuries, each with its own Chapter of Canons.In 816, the Emperor Louis I held a council at Aix, at which it was ordered that Canons and Canonesses live together according to a set of rules (canons, "regulae").In the Roman synod of Pope Eugene II of November 826, it was ordered that Canons live together in a cloister next to the church.