Parish church of San Siro

The parish as a baptismal church, matrix of the minor churches or chapels, in the large districts where it was located, possessed its own patrimony and its plural clergy at the top of which was the parish priest or archpriest. The parish churches were built on the pagus which, in turn, were located near busy roads. In the alleys that made up the pagus chapels are then established which, over the centuries, will become parish churches.
The institution of Ceula was part of the 36 parishes into which the primordial and large diocese of Luni was divided, the last one to the west after which the Genoese one began. It was on the road that, coming from Picentino, branched off towards Genoa or towards Tuscia and Rome. Dedicated to San Siro galileo who, together with Saints Nazario and Celso, evangelized northern Italy.