From what I have read, there were Roman colonies on both the north and south shores of the Mediterranean, and there were Greek colonies in Turkey. In addition, people were dragged or fled from one part of the world to another quite a lot in those days. (Still happens, actually.)

Even if we knew it were true that St George lived in Turkey and was of African descent, the mere naming of localities doesn't tell us much

The important thing is the indubitable fact that he slew a dragon.

What's the BNP?