The Royal Road or Achmaenid Road with its system of way stations and riders aided communication in Darius' empire. The road connected Susa with Persepolis and India.https://www.thoughtco.com/royal-road-of-the-achaemenids-172590
They established the empire by expansion, and settled its structure of governance and civilisation.
Darius was king of the Persian Empire, not a god. Babylon was part of his empire.
The Persian Empire.
The governing system of the Persian Empire, resting on traditional local government, provincial government and central imperial government.
darius used some of persian's great wealth to build roads across the empire
Rhodogune was the mother of Kind Darius of Achaemenid Empire.
Darius put down several revolts. He won more land for the empire and created a government for the empire !
Darius I, known as Darius the Great, was the third king of kings of the Achaemenid Empire. Darius held the empire at its peak, then including Egypt, and parts of Greece. The decay and downfall of the empire commenced with his death and the coronation of his son, Xerxes.
There were three kings named Darius. Which one do you mean?
There were several king callled Darius. Which one are you interested in?
Darius organized the empire by dividing it into 20 provinces.