

Looked into it a bit more. It seems it’s not exactly medieval Spanish but just old and really formal Spanish, akin to Shakespearean. Nevertheless, not something you’d hear nowadays. Everyone else just speaks with a Spaniard accent, there’s no Latin American dialects in the movie.
I remember looking up the script a little while ago. Here’s an excerpt

You will see a luxurious banquet. Don’t eat or drink any of it while you’re there
(Fwiw, I’m from Latin America so Spaniard accents all just sound weirdly posh to me, like that video of a British kid complaining about the ice cream man)



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