Darius the Great.
Satraps
Into Satraps .
Satraps.
The King and his network of Satraps (provincial governors).
The provincial Governors called Satraps, and his central councillors.
One of the nobles of the Persian tribe. There were 20 provinces (satrapies) and 20 governors (satraps)
I guess you refer to Darius I (the Great) the third king of the Achaeminid Empire (the Persian Empire at its greatest extent). He divided the empire into provinces and placed satraps (governors) to administer them. It was a creation of administrative subdivisions.
Satraps ~ look to the related link below for further information .
Each city/tribe/principality had its own traditional government. The Empire was divided into 20 provinces (satrapies) with Persian governors (satraps) who were responsible for internal and external security and collecting taxes. The king and his council supervised and assisted the governors. The political system of rule by one is known as a monarchy.
It expanded the Persians.
By leaving local government in place, overseen by Persian provincial governors (Satraps) with central control by the king and his council.
It was a kingdom. ruled by the king and his council. It was divided into 20 provinces with Persian governors. Local government was by the normal ones of the different peoples - city-states, tribes, principalities.