Leaving local government in the hands of local rulers, with overall control and internal and external security provided by provincial governors under central direction.
Maintaining taxes at a reasonable level.
Secure borders, strong central government by the king and his council, delegated government to the provincial governors, a tolerable level of taxation, armed forces capable of maintaing internal security and protecting the borders, a good communications system, religious tolerance, retaining the local system of government under the provincial governors, encouraging prosperity.
Cyrus established the Persian Empire. Darius consolidated it. Each to his own success.
The Persian Empire.
The Persian Empire was not a person.
Persian Empire
The Persian Empire absorbed the Babylonian Empire.
Retaining local governments under the oversight of Persian privuncial governors who provided internal and external security and kept taxes modest.
Alexander the Great defeated the Persian empire
His success was ready-made - he took over all of the Persian Empire stretching form Libya to Central Asia.
The Persian Empire absorbed the Baabylonian Empire.
The Hindu Kush mountains, the Indus River complex
An empire is an empire, a war is a war.