Darius I of Persia in the context of "Bardiya"

The Battle of Marathon took place in 490 BC during the first Persian invasion of Greece. It was fought between the citizens of Athens, aided by Plataea, and a Persian force commanded by Datis and Artaphernes. The battle was the culmination of the first attempt by Persia under King Darius I to subjugate Greece. The Greek army inflicted a crushing defeat on the more numerous Persians, marking a turning point in the Greco-Persian Wars.

The first Persian invasion was a response to Athenian involvement in the Ionian Revolt, when the city-states of Athens and Eretria each sent a force to support the cities of Ionia in their attempt to overthrow Persian rule. The Athenians and Eretrians had succeeded in capturing and burning Sardis, but they were then forced to retreat with heavy losses. In response to this raid, Darius swore to burn down the two cities that had aided the failed revolt. According to Herodotus, Darius had his bow brought to him and then shot an arrow "upwards towards heaven", saying as he did so: "Zeus, that it may be granted me to take vengeance upon the Athenians!" Herodotus further writes that Darius charged one of his servants to say "Master, remember the Athenians" three times before dinner each day.

Commagene (Ancient Greek: Κομμαγηνή) was an ancient Greco-Iranian kingdom ruled by a Hellenized branch of the Orontids, a dynasty of Iranian origin, that had ruled over the Satrapy of Armenia. The kingdom was located in and around the ancient city of Samosata, which served as its capital. The Iron Age name of Samosata, Kummuh, probably gives its name to Commagene.

Commagene has been characterized as a "buffer state" between Armenia, Parthia, Syria, and Rome; culturally, it was correspondingly mixed. The kings of the Kingdom of Commagene claimed descent from Orontes with Darius I of Persia as their ancestor, by his marriage to Rhodogune, daughter of Artaxerxes II who had a family descent from king Darius I. The territory of Commagene corresponded roughly to the modern Turkish provinces of Adıyaman and northern Antep.

The dory or doru (/ˈdɒruː/; Greek: δόρυ) was the chief spear of hoplites (heavy infantry) in Ancient Greece. The word doru is first attested in the Homeric epics with the meanings of "wood" and "spear". Homeric heroes hold two dorata (Greek: δόρατα, plural of δόρυ) (Il. 11,43, Od. 1, 256). In classical antiquity, the dory was a symbol of military power, possibly more important than the sword, as can be inferred from expressions like "Troy conquered by dory" (Il. 16,708) and words like "doryktetos" (Greek: δορίκτητος) (spear-won) and "doryalotos" (Greek: δορυάλωτος) (spear-taken).

The spear used by the Persian army under Darius I and Xerxes in their respective campaigns during the Greco-Persian Wars was shorter than that of their Greek opponents. The dory's length enabled multiple ranks of a formation to engage simultaneously during combat.

The Book of Ezra is a book of the Hebrew Bible which formerly included the Book of Nehemiah in a single book, commonly distinguished in scholarship as Ezra–Nehemiah. The two became separated with the first printed rabbinic bibles of the early 16th century, following late medieval Latin Christian tradition. Composed in Hebrew and Aramaic, its subject is the Return to Zion following the close of the Babylonian captivity. Together with the Book of Nehemiah, it represents the final chapter in the historical narrative of the Hebrew Bible.

The Book of Ezra is divided into two parts: the first telling the story of the first return of exiles in the first year of Cyrus the Great (538 BC) and the completion and dedication of the new Temple in Jerusalem in the sixth year of Darius I (515 BC); the second telling of the subsequent mission of Ezra to Jerusalem and his struggle to purify the Jews from marriage with non-Jews.

The Xerxes I inscription at Van, also known as the XV Achaemenid royal inscription, is a trilingual cuneiform inscription of the Achaemenid King Xerxes I (r. 486–465 BC). It is located on the southern slope of a mountain adjacent to the Van Fortress, near Lake Van in present-day Turkey. When inscribed it was located in the Achaemenid province of Armenia. The inscription is inscribed on a smoothed section of the rock face near the fortress, approximately 20 metres (70 feet) above the ground. The niche was originally carved out by Xerxes' father, King Darius (r. 522–486 BC), but he left the surface blank.

Arsames (Old Persian: 𐎠𐎼𐏁𐎠𐎶 Aršāma, modern Persian:،آرسام، آرشام‎ Arshām, Greek: Ἀρσάμης) was the son of Ariaramnes and the grandfather of Darius I. He was traditionally claimed to have briefly been king of Persia during the Achaemenid dynasty, and to have given up the throne and declared loyalty to his relative Cyrus II of Persia before retiring to his family estate in the Persian heartland of Parsa, living there peacefully for the rest of his life, perhaps nominally exercising the duties of a "lesser king" under the authority of the "Great King". However, the claim that he or his son were ever kings is rejected by historians such as Pierre Briant. In an inscription allegedly found in Hamadan he is called "king of Persia", but the document is widely argued to be a forgery, either modern or ancient. Another attestation of his reign is the Behistun Inscription, where his grandson Darius I lists him among his ancestors, although he does not explicitly mention him as being one of the anonymous eight kings whom he claims preceded him.

Arsames was the father of Hystaspes (satrap of Parthia), Pharnaces (satrap of Phrygia) and Megabates (a general). Arsames lived to see his grandson, Darius I, become the Great King of the Persian Empire, though he died during his reign. Arsames and his son Hystaspes are noted as being alive in 522 BC, indicating that he had survived well into old age.