river Orne. Although the region was heavily populated during the Gallo Roman period the town is not mentioned in any texts until the 11th century. The toponym comes from the Gaulish words argentos ("silver") and magos ("market"). The town grew in importance during the Middle Ages.

Middle Ages

The towns fortifications were built or rebuilt on Gallic or Gallo-Roman remains by the order of Rollo "the Walker"

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