The imagery depicted on this altar refers to two of the Twelve Labors of Hercules: the slaying of the Nemean lion; and the capture of the Erymanthian boar. In the first labor, Hercules was ordered to kill the lion, which haunted the area around Nemea. Its hide was so thick that it was impenetrable to weapons. The capture of the boar was the fourth labor. It was a giant and dangerous creature that lived on Mount Erymanthos, which Hercules successfully captured by driving it into the snow.