Darius II ( ; ), also known by his given name Ochus ( ), was King of Kings of the Achaemenid Empire from 423 BC to 405 or 404 BC.
Following the death of Artaxerxes I, in 424 BC or 423 BC, there was a struggle for power between his sons. The victor, Ochus, adopted the name Darius (Greek sources often call him Darius Nothos, "Bastard"), in reference to his unattested lineage. His reign was marked by a series of revolts by various satraps and involvement in the Greek Peloponnesian War.
It seems that Darius II was quite dependent on his wife Parysatis. In excerpts from Ctesias, some harem intrigues are recorded, in which he played a disreputable part. Darius II is potentially mentioned in the books of Haggai, Zechariah, and Ezra–Nehemiah of the Hebrew Bible (the Christian Old Testament). There is some debate on whether these books refer to Darius the Great though.
Rise to power
thumb|Location of Darius II in the Achaemenid family tree.
Texts from the Babylonian Murashu Archive date the transition from Artaxerxes I to Darius II between December 424 BC and February 423 BC. These Babylonian records do not reference any other contenders for the Persian throne directly, but Classical Greek and Latin historians, primarily Ctesias of Cnidus, describe a struggle for power within the Achamenid royal family. Darius II received his royal name and recognition from supporters in Babylon, while his half-brothers, Xerxes II and Sogdianus, claimed authority elsewhere in the Empire. After just 45 days, Sogdianus orchestrated Xerxes's assassination.
Soon after defeating his half-brothers, Darius’s full brother, Arsites, rebelled for unclear reasons. Arsites was Satrap of Syria and had the support of Artyphius, son of the earlier rebel Satrap Megabyzus. Darius sent an army to confront his brother under the command of Artasyrus, a Bactrian nobleman. The rebels defeated Artasyrus' army in two engagements, but they were defeated in a third. After that defeat, Artasyrus bribed the Greek mercenaries in Arsites's army to surrender and captured Artyphius. Artyphius was temporarily spared on Parysatis’ advice to demonstrate the new regime’s leniency. When Arsites surrendered, he and Artyphius were both executed with hot ashes as well. When in 413 BC, Athens supported the rebel Amorges in Caria, Darius II would not have responded had not the Athenian power been broken in the same year at Syracuse. As a result of that event, Darius II gave orders to his satraps in Asia Minor, Tissaphernes and Pharnabazus, to send in the overdue tribute of the Greek towns and to begin a war with Athens. To support the war with Athens, the Persian satraps entered into an alliance with Sparta. In 408 BC he sent his son Cyrus to Asia Minor, to carry on the war with greater energy.
Darius II may have expelled various Greek dynasts who had been ruling cities in Ionia: Pausanias wrote that the sons of Themistocles, which include Archeptolis, Governor of Magnesia, "appear to have returned to Athens", and that they dedicated a painting of Themistocles in the Parthenon and erected a bronze statue to Artemis Leucophryene, the goddess of Magnesia, on the Acropolis. They may have returned from Asia Minor in old age, after 412 BC, when the Achaemenids took again firm control of the Greek cities of Asia, and they may have been expelled by the Achaemenid satrap Tissaphernes sometime between 412 and 399 BC. In effect, from 414 BC, Darius II had started to resent increasing Athenian power in the Aegean and had Tissaphernes enter into an alliance with Sparta against Athens, which in 412 BC led to the Persian conquest of the greater part of Ionia.
Darius is said to have received the visit of Greek athlete and Olympic champion Polydamas of Skotoussa, who made a demonstration of his strength by killing three Immortals in front of the Persian ruler. A sculpture representing the scene is visible in the Museum of the History of the Olympic Games of antiquity.left|thumb|Prospective [[Tomb of Darius II in Naqsh-e Rostam]]Darius II died in 404 BC, in the nineteenth year of his reign, and was followed as Persian king by Artaxerxes II.