Maester Steven, may I please ask which accents from Our World you would employ as a shorthand for the different ways of speaking to be found across the Seven Kingdoms and the divergent dialects of the Free Cities? (for some reason my own tendency has been to associate the Vale of Arryn with a fairly “Scottish” accent, not least because the Isle of Arran may be found off Scotland’s cost; I also tend to imagine the Riverlands as sounding Southern Irish while the Iron Isles have an Ulster sound).

Funny, I’ve always thought of the people of the Vale as having something of a Welsh accent. Must be all those mountains and valleys, and the fact that I saw Pride recently and that movie really makes you want to say everything in a Welsh accent.

Don’t really have much of a headcanon of other Westerosi accents. We know that  “the Dornish speak the Common Tongue” with an accent that involves “stretching some sounds, rolling others, and lilting still others in odd places,” due to the influence of Rhoynish. We know that there is a distinct Northern accent, as Brienne meets a member of the BWB (likely Harwin whose voice is “frosted with the accents of the north.” Given that the names of the FIrst Men are described as “short and blunt and to the point,“ and that the Old Tongue is described as sounding “gruff and guttural, but Jon heard the music in it and recognized the Old Tongue,” the Northern accent is likely similar. 

The Free Cities I’ve always thought of as having various Romance language accents, given their common linguistic decent from Valyrian similar to the relationship between the Romance languages and Latin. Although in-universe their accents in Westerosi are described as “liquid” or “lilting.”