Between 1200 and 1600 actually, it was over quite a Long time period. Although language has changed considerably constantly throughout it's history.
Pretty much all of the accents in Rome and Medieval were innacurate, simply because nobody spoke then like they do now. It would be extremely difficult for a modern english speaker to understand an english speaker from a few hundred years ago.
For instance eggs. Eggs used to be known as eyren, and the word 'eggs' was completely unknown. And meat used to be a word used in general to apply to any kind of food. So not only does the accent change, but the words change meaning as well.
A good example is the word 'nice'. Nice used to mean 'not-knowing' or ignorant. Describing someone as nice would have been an insult a few hundred years ago.

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