“Encapsulated ignorance. There is zero evidence for Koine as a societal language.”
You are like talking to a Flat Earther. The things you spout are so ridiculous I suspect it may be a put on.
Koine Greek was the common language of the vast empire created by Alexander the Great circa 330 BC. It remained the common language of the eastern Roman Empire. It was the common tongue and not polished like Classical Greek but by the time of Christ had become a literary language.
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No, Koine was not Alexander’s language.
His was closer to the language of the classical era.