Medusa's head in white marble, AD 307. Roman copy of Greek original. For more information: Classical Antiquities of the Villa San Michele, I by Arvid Andrén: Opuscula Romana, V, Lund 1965, p. 129 or Roman Marble by Agneta Freccero, Stockholm: Wahlström & Widstrand 2003, p. 131: Peter de RuMedusa's head (VSM 749) in white marble hangs above the writing desk in the studio.
Erdeös writes:
...which Munthe reputedly found on the seabed off Palazzo a Mare.
Even if it is a good story, the truth might be different. Possibly the mask comes from the Tempio di Venere e Roma in Rome.