So, as it stands the carbon arc lamp has been around for a long time, and all it needs is a strip of carbon as a filament - Davy used a thin slice of charcoal, Edison used carbonised bamboo - which could burn for 1200-hours. The one thing you will notice is that the light bulb is pretty simple. Glass and various kinds of carbonised wood were available during and well before the Roman age, as was, it appears, batteries of similar power to those Davy used. Did these ingredients all end up with an ancient glowing filament? Well, it appears, just possibly, it did. Within the ancient Dendera Temple complex in Upper Egypt the walls of the 2nd or 1st-century BC Hathor Temple reveal something of a mystery. A long transparent vessel containing what appears to be a snake stretched lengthwise is held at one end by a man. Is it a mythological image, or is it a very large carbon arc light bulb with wires running from it to a battery? The carving does date to a time just when glass blowing was becoming mainstream, it does date to the same era as the Baghdad batteries, and this was the age of classical invention by the Greek scholars living to the north in Alexandria. Does this make a light bulb? Well, I don't think it can be completely ruled out.
Find out if Calvus saw the light