I don't know the lore very well, but I took a few hours to read the wiki yesterday, to know a bit more about it before i begin poe 2.
Here is what the language section says:
https://pillarsofeternity.gamepedia.com/Languages
Apparently Dyrwoodans use somes words from Vailian language, which is probably the influence that gkathellar is refering to.
So i think Aedyr could be seen as England, and Vailia as some sort of Roman empire.
That is, if we want to make a comparaison with the real world, which is maybe true to some degree, but maybe not.