That doesn't count as an argument in my book. Constantinople was officially called "Nova Roma", which means "New Rome". And as I said, Greek was indeed the official language after some point. But that is mainly because the majority of the population was more familiar with Greek, especially in Greece where the population spoke some kind of Greek dialect and where the Empire itself was based.
Oh, and just for you to know, during the years of the Republic or early years of the Empire (at least that's the extend of my knowledge on the specific subject) cities like Athens and Alexandria still used Greek. Not to mention a "good" education of any Roman included Greek after some point. It's called influence. Not to mention the fact that Latin was probably only used as an official language in writing and quoting laws etc., local languages of conquered tribes especially in very autochthonous areas probably outlived any Latin influence long after the split and disintegration of the Empire.
Maion
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