They established the empire by expansion, and settled its structure of governance and civilisation.
Darius revolutionized the economy by placing it on a silver/gold coinage system. Trade was extensive, and under the Achaemenids there was an efficient infrastructure that facilitated the exchange of commodities among the far reaches of the empire.
There were several Persian leaders called Darius - they were kings of Persia.
Darius was a Persian.
darius I darius I
Persian King
Persian King
There is not just one Persian Empire. There are several. If you are specifically referring to the Persian Empire of Cyrus the Great, Darius, and Xerxes, that empire was overrun by Alexander the Great between 334-324 B.C.E.
No - Darius I was not a Mede, he was Persian. And Persians and Medes were not black, they were Indo-European.
darius used some of persian's great wealth to build roads across the empire
Who is 'you do'.
Darius and Xerxes.
They were leaders the Persian Empire. Darius was the father of Xerxes. Darius led the Persians in the first Persian war, while Xerxes led the Persians in the second Persian war.