I’ve been thinking a lot ever since I first cracked the books in the series A Song of Ice and Fire and watched the HBO show Game of Thrones about the language in the world GRRM has created. Aside from the fact that most all of the actors speak British English (bravo, Peter Dinklage), there are a lot of interesting accents (bravo, Pedro Pascal), dialects, languages, and such to contend with on screen.
Off screen, in the written word, there’s a lot going on as well. There’s a great essay here taking apart what’s happening, what GRRM has done and hasn’t done, and things like the necessity of having professional linguists create Dothraki and Valyrian, etc. Click through, it is absolutely worth a read.