town, Loire departement, Rhone-Alpes region, east central France, headquarters of an arrondissement, on the Loire River. Founded in the Romano-Gallic age, it was originally called Rodumna. The 11th-century castle-donjon is the only surviving remnant of its ancient castle. The centre of the town is the Carrefour Helvetique (Helvetian Crossroads). The Lycee Jean Puy occupies the former 17th-century Jesuit college
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