Hēlios in Later Traditions
The Romans identified Hēlios with Sol, though Apollo increasingly absorbed solar attributes in both Greek and Roman religion — the identification never complete enough to erase Hēlios's older, purer identity as the sun itself. The emperor Aurelian made Sol Invictus ('the Unconquered Sun') the official patron of the Roman Empire in 274 CE; the cult's late-December festival later influenced the dating of Christmas. In Hellenistic Egypt, Hēlios was syncretized with Ra and Horus as a universal deity, and the Greek magical papyri invoke 'Helios' as the cosmic ruler. Neoplatonists — above all Julian the Apostate, whose hymn to the King Helios survives — saw Hēlios as the visible image of the intelligible sun, the One. The scientific era gave his name its most famous afterlife: Copernicus's heliocentric model made Hēlios, not Earth, the center of all things — the god's revenge on geocentrism.


