 When the Christianity expanded in the Roman Empire, Cirié picked up Cyriacus (martyrized in Rome in 303) as patron saint, due to the similarity of his name with the ancient castrum denomination.The famous Il celebre "Theatrum Statuum Sabaudiae" (1682, a sort of guide of the Savoy territories) gives a long and detailed description of Cirié (""Septimo Taurinense ad Urbe lapide, Septentrionem versus, non longe ab Alpium Graiarum radicibus, occurrit Ciriacum Oppidum, insigne Marchionatus titulo, qui sub se S.Mauritium, Nolas & Robasomerium minora Oppida comprehendit"") and cites the probable origin of the village name as being related to the martyr (""Pedemontanis dicitur Cirié, fortasse a peculiari Incolarum erga Divum Cyriacum Martyrem cultu, cujus festum s.Idus Augusti inibi summa celebritate recolitur"").Roman presence in Cirié is testified by several Roman coins, shards of vases and funerary stele (preserved in the San Martino church).