AHC: Make Greek the Lingua Franca

Hello everyone, just as the title says. Does not necessarily have to be OTL Greek (it can change dramatically depending on the course of your TL) but must come from the same origin. Bonus points if it is mutually intelligible with Classical Greek, as i have heard is the case OTL. Acceptable if is fractured in the same way as Latin.


And when i say Lingua Franca, I mean it covers a solid chunk of the globe. This website would be in Greek, so on. Any non native speakers would have to learn it in order participate in the global conversation.
 
Greek Bible instead of Vulgata as the canon Bible. Since Christian Church/Churches is/are expanding, Greek expands together as lingua franca.
 
Surviving Byzantine and Western Europe stays weak much longer. Probably would be good if Prophet Mohammed and Islam butterfly away. Later Byzantine becomes colonial power.
 
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