Deposited there via seismic activity, it was built in the ancient spa town of Baiae, where it would have lined the floors of a patio in a seaside villa owned by the Roman patrician class.

Author: Parco Archeologico Campi Flegrei;

The villa is part of an area of land that became submerged as the result of a geological phenomenon called bradyseism, during which the ground rises or, as in this case, falls due to pressure under the surface.