San Giovanni a Mare, Naples

San Giovanni a Mare (Italian: [ˈsan dʒoˈvanni a mˈmaːre] St. John at Sea) is a church in Naples, Italy; located near the docks, not far from the church of Sant'Eligio Maggiore.

In the atrium is a copy of an ancient Greek bust; the original is currently in the Palazzo San Giacomo.

Now referred to as Donna Marianna or the Head ("Testa") of Naples, it was once found in the Piazza del Mercato ("Plaza of the Marketplace").

The bust was most likely once part of a sculpture depicting the Greek mythological siren Parthenope, associated with the story of Odysseus, and specifically associated with the craggy cliffs and islands in the Bay of Naples.

Over time the pagan bust became a symbol of the city, and paradoxically found itself protected inside a church.