Thomas Ashby, 1911 Encyclopædia Britannica, Volume 2… (1911)
“ The church of S. Gregorio is built into a Roman tetrastyle Corinthian temple, two columns of which and the cella are still preserved; the site of the Roman theatre can be distinguished; and the church and convent of the Annunziata (with two fine cloisters and a good fresco by Cola d’ Amatrice in the refectory) are erected upon large Roman substructures of concrete, which must have supported some considerable building. Higher up is the castle, which now shows no traces of fortifications older than medieval; it commands a fine view of the town and of the mountains which encircle it. ”
