He consolidated the work of his predecessors Cyrus the Great and Cambyses by establishing security and prosperity.
However his attempt to further security by attempting to incorporate the Greek city-states of mainland Greece into the Empire to prevent their destabilising the Greek cities within the Empire failed after his expeditionary forces were repelled in 490 BCE and 480-479 BCE.
Darius the Great was king 522-484 BCE.
king Cyrus and king darius
Notably , it was Alexander the great , the king of Macedon who defeated the Persian king Darius the 3rd .
King Darius I (the Great).
Darius the Great.
Darius the Great.
King Cyrus the Great. King Cambyses II. King Darius the Great.
Cyrus the Great Darius I the Great Xerxes I the Great
King Darius I (the Great).
Darius the Great.
Darius the Great.
King Darius the Great.