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This marble relief depicting Mithras killing the bull, found at Porto d’Anzio in 1699 and now lost, is known from a engraving by del Torre.
Antium was an ancient coastal settlement in Latium, founded around the 11th century BC. A major stronghold of the Volsci before its conquest by Rome, its territory largely corresponds to modern Anzio and Nettuno.
The Mithraeum of Spoleto was found in 1878 by the professor Fabio Gori on behalf of Marquis Filippo Marignoli, owner of the land.