http://en.wikipedia.org/wiki/Darius_I_of_Persia
WHILE I DO FIND THE INTERNET A RATHER UNRELIABLE AND BIASED SOURCE FOR HISTORY, I WILL ATTEMPT TO BOTH WRITE A FULL ESSAY BY PHD HISTORIAN REFFERALS, AND INTERNET REFFERANCE. DARIUS THE FIRST, A MIGHTY GENERAL DURING THE TIME OF CYRUS THE GREAT, SUCCEEDS CYRUS AFTER HIS DEATH. DARIUS 1ST THE GREAT (DARIUSH BOZORG) WAS A GREAT LAW GIVER WHO TOTALY IMPROVED THE VAST CYRUS'S EMPIRE BY FOR THE FIRST TIME IN HISTORY: