The empire revived briefly under Diocletian (A.D. 284-305) and Constantine (A.D. 306-37 ... as it existed during the Roman Empire. The map's origins were obscure: a 13th-century monk from ...

We now have, Paul says, a new map of the world ... by the time of the conversion of Constantine becomes the official religion of the Roman Empire. And even then, that's not a simple transformation.