Palatine Hill
The small altar was found near Sant'Anastasia on the lower west part of the Palatine Hill in 1829. Made of travertine, it has the hourglass shape that came into use in Rome around the time of the Second Punic War. The "Ara Calvini" ("Altar of Calvinus"), sometimes called the "Ara Dei Ignoti" ("Altar of the Unknown God"), is in the collections of the Antiquario Palatino (Palatine Hill Museum).