since i'm still going through some of a.h.m. jones's the later roman empire, you get to, too. today we will learn that the arabs used greek as their administrative language for a fair chunk of time.
In Syria and Egypt Greek does not seem to have outlived the end of Roman rule by more than about a century. It was maintained by the Arabs as their administrative language until the middle of the eighth century, but when the caliphs ordered the use of Arabic in the government offices it quickly died out.