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Oresthasium was a village in ancient Arcadia, south-east of Megalopolis. It was, according to myth, founded by Orestheus, King of Arcadia, but it was also mythologically connected to Orestes; in historical times, it formed part of the territory of Maenalus, but, upon the foundation of Megalopolis in 371 BC, Oresthasium was abandoned and incorporated into Megalopolis.