Answer:
The answer is 539
Step-by-step explanation:
In 539 B.C., Persian forces defeated the Babylonian army at the site of Opis, east of the Tigris. ... 522–486 B.C.), claiming in his inscriptions that a certain “Achaemenes” was his ancestor. Under Darius the empire was stabilized, with roads for communication and a system of governors (satraps) established.
