"And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth."
..........................Revelation 6:8

..............When the "beasts" destroyed the earth during the days of the Fourth Horseman, the territory allowed was "over a fourth part of the earth".

...........................This is very close around the area of the Old Roman Empire.