CnP: But it was built 600 years earlier, in the 9th century, wasn't it?
LP: True, you are quite right, the first document that mentions Castello di Paderna is a lease contract dated December 1, 817! And the oldest part of the castle is inside. It is a small square-shaped church inside the castle. Its building materials date back to the Roman times! The layout of the church is based on the winter solstice principle, the old altar faces East and on the solstice day the light comes from the window and illuminated the center of the church.