Keystone Figures Self-researched

Location: Arch of Constantine, Rome
Medium: Marble relief
Date: c. AD 312–315

The keystones of the three arches feature carved busts or figures. The central arch keystones show Sol (the sun god) on the east side and Luna (the moon goddess) on the west, representing the cosmic order under Constantine's rule. The lateral arch keystones depict Mars, Roma, and other deities or personifications.