Welsh myth misconceptions (mythconceptions, wahey!)
This isn't me trying to yuck on anybody's yum, btw.
Agronā isn't a real goddess. She's made up. She has no factual basis and she was never worshipped. The Mabinogion does not mention her, and she was basically a hypothetical some dude made up to happy to the River Ayr because in the 1920's Scottish Nationalists were trying to claim Taliesin's battle poems for Scotland (as in being set there.)
Gwenhwyfar isn't a goddess and I think it's been taken out of proportion a lil because of Arthur having three wives all named Gwenhwyfar. Guy probably just really loved the name or was like 'guess I'd better marry a lady who has the exact same name so I don't have to learn another one' which is exactly the behaviour I'd expect from a guy who wanted to re-kidnap an already kidnapped princess for himself. She's probably cognate with Findabair in Irish myth tbh. She is very much a Cewri and maaaaybe had some myths ascribed to her that have been lost like, you know, 99% of Welsh mythology's lads and lasses.
I have fallen into this trap, but there's no evidence that Lleu Llaw Gyffes is the god of kingship other than him having a name that sounds like Lugh. I would not trust the guy with a wife made out of flowers to rule a kingdom. It goes very badly for him when he tries. He never even gets an heir. Like idk what to tell you.
For what it's worth, Branwen and Creiddylad weren't venerated as goddesses. I have seen websites say they were but that's a big old nope.
Madog ap Owain Gwynedd never discovered America. The Tudors made him up sonthey could lay claim to it as being part of their 'ancestral land'.
Pls don't take The White Goddess by Robert Graves as fact. Man was using outdated sources at the time to satisfy his own version of what he believed Celtic Mythology was and many of his proposed theories are false tbh. If you're looking for a guy who knows his shit can I suggest either Barry Cunliffe or Ronald Hutton?
Okay, these are some lil bits. There's probably more but yeah.