The solar eclipse of 319 AD is represented on this coin by the star and crescent in the lower field of the reverse. Crispus was the first born son of Emperor Constantine and Minervina. Two Victories are standing with an inscribed shield over an altar. It appears the solar eclipse was associated with Roman victory in battle. Arles was along the southern coast of France. It was an important military headquarters for Constantine.
Photo Victor's Imperial Coins