Political- Darius embarked on a campaign to Egypt where he defeated the armies of the Pharaoh and secured the lands that Cambyses had conquered while incorporating a large portion of Egypt into the Achaemenid Empire.
Economic- Darius undertook impressive construction projects across the empire. In Susa, he built a palace complex in the northern part of the city, which became his favorite residence. In Egypt, he built many temples and restored those that had previously been destroyed. Darius is often renowned above all as being a great financier. He fixed the coinage and introduced the golden Daric. He tried to develop the commerce of the empir
Social/Cultural- Darius was an adherent of Zoroastrianism, a firm believer in Ahura Mazda. Darius believed that Ahura Mazda had appointed him to rule the Achaemenid Empire. He supported faiths and religions that were "alien" as long as the adherents were submissive and peaceable, sometimes giving them grants from his treasury for their purposes.