I have just finished reading the first volume of a four volume translation of the Hermetica, a collection of ancient Egyptian philosophies as re-written by slightly-less-ancient Greeks. In it, there is repeated mention of Agathodaemon as a representation of part of God (the over-arching idea so far is that god is all things, all things are created by god and with the material of god, and Destiny, Necessity, -- basically his will is played out by a hierarchy of his representatives that are also him because everything is him... anywayssss) which stuck in my mind as something/someone I wanted to look further into.
Looking further into it, Agathodaemon refers to a lot of things, but I think you can see all those things funneling downwards towards a specific center. A fragment of Egyptian alchemist writings attributed to Agathodaemon who created a particular type of poison. Interesting! Sometimes associated with the Egyptian god, Set. (Fella who cut up his brother Osiris for Isis to have to find and piece back together.)
Digging deeper, however, Agathos Daimon was a Roman gladiator whose epitaph reads: Agathos Daimon alias ‘Camel’, an Alexandrian, boxer, victor in Nemea. He died here in the stadion in the fight after promising Zeus either victory or death. Aged 35. Farewell.
Agathos Daimon was a common name for Alexandrians, it means “the good spirit” and Agathos Daimon was the serpent protector god of Alexandria.
Digging further into that, the story is that when Alexandria was being built, a giant serpent already lived there and began eating the workers, causing them to live in fear. Alexander, when he heard of the disturbance, ordered the beast be hunted down and slain. Once that was done, he ordered a shrine to that beast be built as its mausoleum at the spot where it had been slain. When the shrine was completed, non-poisonous snakes poured forth from it. That is how the serpent figure became the god of Alexandria, where the texts of the Hermetica were originally likely written and spoken. When a snake entered an Alexandrian home, it was worshipped as a kindly protector of the home, driving out venomous creatures.
The snake drove out those with poisonous intentions. There are ancient letters telling of snakes leading Alexandrian bound travels through the featureless desert to their intended location; of a snake winding itself around the head of a deposed Alexandrian leader to protect its features from carrion activity; appearing in a fever dream to tell the dreamer the correct antidote for the poison which was killing them. Agathodaemon is invoked in surviving ancient texts being called “the Helper,” as whom “permitted [Isis] to rule in the entire Black Land,” “for whom all gods serve as body-guards.”
I truly believe that the ancient Greeks who translated these texts from Egyptian stripped away the importance of this particular name for the all encompassing good that is the source of all things, to the Hermetics. I also find it veeeeeeerrryyyy interesting that the religion that the Hermetics disliked and avoided speaking about, Christianity, turned the snake into a liar, when it is made very clear in ancient texts that snakes were very wildly and very specifically associated with Alexandrians and Egypt.