YouTuber Korean Billy is a language enthusiast who is especially fond of exploring the realm of British English regional dialects.
Although there are various discrepancies and inconsistencies regarding accents in the HBO series, it is generally true that characters from The North (and beyond) tend to speak with a Northern English accent (Yorkshire in particular) while those from the southern lands (except Dorne) are heard in standard British English of the southeast. Americans often refer to the latter as BBC English.
In the video above, Korean Billy demonstrates how several well known phrases are pronounced in different parts of Westeros.











