Darius the Great

Darius I (Old Persian: 𐎭𐎠𐎼𐎹𐎺𐎢𐏁 Dārayavaʰuš; c. 550 – 486 BCE), commonly known as Darius the Great, was the third King of Kings of the Achaemenid Empire, reigning from 522 BCE until his death in 486 BCE. He ruled the empire at its territorial peak, when it included much of West Asia, parts of the Balkans (Thrace–Macedonia and Paeonia) and the Caucasus, most of the Black Sea's coastal regions, Central Asia, the Indus Valley in the far east, and portions of North Africa and Northeast Africa including Egypt (Mudrâya), eastern Libya, and coastal Sudan.

Darius ascended the throne after overthrowing the Achaemenid monarch Bardiya (or Smerdis), who he claimed was in fact an imposter named Gaumata. The new king met with rebellions throughout the empire but quelled each of them; a major event of Darius's career described in Greek historiography was his punitive expedition against Athens and Eretria for their participation in the Ionian Revolt.

Darius organized the empire by dividing it into administrative provinces, each governed by a satrap. He organized Achaemenid coinage as a new uniform monetary system, and he made Aramaic a co-official language of the empire alongside Persian. He also put the empire in better standing by improving roads and introducing standard weights and measures. Through these changes, the Achaemenid Empire became centralized and unified. Darius undertook other construction projects throughout his realm, primarily focusing on Susa, Pasargadae, Persepolis, Babylon, and Egypt. He had an inscription carved upon a cliff-face of Mount Behistun to record his conquests, which would later become important evidence of the Old Persian language.

Dārīus and Dārēus are the Latin forms of the Greek Dareîos (Δαρεῖος), itself from Old Persian Dārayauš (𐎭𐎠𐎼𐎹𐎢𐏁, d-a-r-y-uš; which is a shortened form of Dārayavaʰuš (𐎭𐎠𐎼𐎹𐎺𐎢𐏁, d-a-r-y-v-u-š). The longer Persian form is reflected in the Elamite Da-ri-(y)a-ma-u-iš, Babylonian Da-(a-)ri-ia-(a-)muš, and Aramaic drywhwš (𐡃𐡓𐡉𐡅𐡄𐡅𐡔) forms, and possibly in the longer Greek form, Dareiaîos (Δαρειαῖος). The name in nominative form means "he who holds firm the good(ness)", which can be seen by the first part dāraya, meaning "holder", and the adverb vau, meaning "goodness".

At some time between his coronation and his death, Darius left a tri-lingual monumental relief on Mount Behistun, which was written in Elamite, Old Persian and Babylonian. The inscription begins with a brief autobiography including his ancestry and lineage. To aid the presentation of his ancestry, Darius wrote down the sequence of events that occurred after the death of Cyrus the Great. Darius mentions several times that he is the rightful king by the grace of the supreme deity Ahura Mazda. In addition, further texts and monuments from Persepolis have been found, as well as a clay tablet containing an Old Persian cuneiform of Darius from Gherla, Romania (Harmatta) and a letter from Darius to Gadates, preserved in a Greek text of the Roman period. In the foundation tablets of Apadana Palace, Darius described in Old Persian cuneiform the extent of his Empire in broad geographical terms:

Darius the great king, king of kings, king of countries, son of Hystaspes, an Achaemenid. King Darius says: This is the kingdom which I hold, from the Sacae who are beyond Sogdia to Kush, and from Sind (Old Persian: 𐏃𐎡𐎭𐎢𐎺, "Hidauv", locative of "Hiduš", i.e. "Indus valley") to Lydia (Old Persian: "Spardâ") – [this is] what Ahuramazda, the greatest of gods, bestowed upon me. May Ahuramazda protect me and my royal house!

— DPh inscription of Darius I in the foundations of the Apadana Palace

Herodotus, a Greek historian and author of The Histories, provided an account of many Persian kings and the Greco-Persian Wars. He wrote extensively on Darius, spanning half of Book 3 along with Books 4, 5 and 6. It begins with the removal of the alleged usurper Gaumata and continues to the end of Darius's reign.