Poseidon and the Underground Snake-God

Goal: to gather data for assuring a hypothesis that PIE mythology include a deity from the underground, earthquake-bringer, snakelike.

Traits:

*bHudH- “bottom”

Ahir Budhnya (India), Python (Greece), Nidhöggr (Scandinavia)

*eg^Hi-, H2engW(H)i- “snake”

Ahir Budhnya (India), Az^i Dahaka (Persia), Ekhidna and Typhon (Greece), Nidhöggr (Scandinavia)

*dHubH- “dark”

Typhon (Greece), Domnu (Ireland)

earthquakes

Typhon, Poseidon (Greece), Loki (Scandinavia)

How Poseidon fits into this scheme? Poseidon’s name has many dialectal variants: Poteida:n, Potida:n, Pohoida:n, Poseida:on. I think this great variety implies a hard adaptation of a non-Greek name. So, linking this name to *poti- or any another Greek etymology is implausible (I don’t believe that posei- is a frozen vocative *potei-). The Mycenian form is po-se-da-o, which implies *poseida:hon.

How this name can be analysed?

*Po-seida:h-on

*Posei-da:h-on

*Pose-ida:h-on

An idea occurred to me: a link between Poseida:hon and Ahi Budhnya (inverted, Budhnya Ahi). The source would be another IE language.

So, following this way:

*Pot-/Pos- < *bHudH(yo-)

*ida:hon < *eg^Hi (this is more rough)

Conclusion:

I’m studying this hypothetical entity, it was a kind of dragon or dragon-god (H1eg^Hi-, H2egWHi-), underground-dwelling (*bHudH-, *ni-), dark (dHubH-), its power or bulk provoking earthquakes (cf. Loki, Typhon, Poseidon), venomous or fire-breathed.