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ALSIUM (mod. PALO), ancient town, Etruria, on the Via Aurelia, about 22m. from Rome. It was one of the oldest cities of Etruria, colonized by Rome in 247 B.C., but was of importance only as a resort of wealthy Romans, many of whom (e.g., Pom pey and the Antonine emperors) had villas there, considerable remains of which exist. The mediaeval castle belongs to the Odescalchi family.