Darius, who ruled from 521 BC to 486 BC added a new Persian province in western India. He then conquered Thrace in Europe, created the world's largest empire to that time. Contact with Greece led Darius to invade the Greek mainland. He also created an army known as the immortals because whenever a member was killed, he was immediately replaced. So what I'm trying to say is that he is was the guy who led Persia to victory and power.
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Into Satraps .
No - Cyrus the Great.
He made the Royal Road which allowed quick communications and promoted trades.
darius I darius I
Darius son of Hystaspes.