Echoes
Hephaestus, Sethlans and Svarog
One god under three names, across The Olympian Order, The Etruscan World and The Northern Inheritance.
Why the sources call them one god
gloss on the Greek Hephaestus (in a translation of the Byzantine chronicle of John Malalas), where Svarog is given as the Slavic equivalent
From the entry on Svarog, naming Hephaestus
He was the Etruscan equivalent of the Greek Hephaestus and the Roman Vulcan
From the entry on Sethlans, naming Hephaestus