Anyhow, Sol Invictus is traditionally connected to Christmas (Normally the 25th of December , here in Sweden the 24th) and I simply want to say happy dies natalis Sol Invictis!
A man (or the god himself) with the characteristic sun ray diadem. Compare the epithet (invictus) to this altar to Hercules. Mosaic from Ostia.
"One morning when Aurora had quenched the fires of night, and the sun’s rays had thawed the frosty grass, they came to their usual places. [...] They were satisfied with their plan, and the light, slow to lose its strength, was drowned in the waters, and out of the same waters the night emerged."
Ovidius - Metamorphoses IV
Translated by A. S. Kline