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Darius I of Persia in Wikipedia
Darius I was the third king of kings of the Achaemenid
Empire. Darius held the empire at its peak, then including
Egypt, and parts of Greece. The decay and downfall of the
empire commenced with his death and the coronation of his
son, Xerxes I.
Darius ascended the throne by assassinating the alleged
usurper Gaumata with the assistance of six other Persian
noble families; Darius was crowned the following morning.
The new emperor met with rebellions throughout his kingdom,
and quelled them each time. A major event in Darius' life
was his expedition to punish Athens and Eretria and
subjugate Greece (an attempt which failed). Darius expanded
his empire by conquering Thrace and Macedon, and invading
the Saka, Iranian tribes who had invaded Medes and even
killed Cyrus the Great. 
Darius organized the empire, by dividing it into provinces
and placing governors to govern it. He organized a new
monetary system, along with making Aramaic the official
language of the empire. Darius also worked on construction
projects throughout the empire, focusing on Susa, Babylon,
and Egypt. Darius created a codification of laws for Egypt.
He also carved the cliff-face Behistun Inscription, an
autobiography of great modern linguistic significance...
Darius II of Persia in Wikipedia
(Dārayavahuš), originally called Ochus and often surnamed
Nothus (from Greek νόθος), was king of the Persian Empire
from 423 BC to 404 BC.
Artaxerxes I, who died on December 25, 424 BC, was followed
by his son Xerxes II. After a month and a half Xerxes II was
murdered by his brother Secydianus or Sogdianus (the form of
the name is uncertain). His illegitimate brother, Ochus,
satrap of Hyrcania, rebelled against Sogdianus, and after a
short fight killed him, and suppressed by treachery the
attempt of his own brother Arsites to imitate his example.
Ochus adopted the name Darius (in the chronicles he is
called Nothos"). Neither Xerxes II nor Secydianus occurs in
the dates of the numerous Babylonian tablets from Nippur;
here the reign of Darius II follows immediately after that
of Artaxerxes I.
Prospective tomb of Darius II of Persia in Naqsh-e Rustam
Of Darius's reign historians know very little (a rebellion
of the Medes in 409 BC is mentioned by Xenophon), except
that he was quite dependent on his wife Parysatis. In the
excerpts from Ctesias some harem intrigues are recorded, in
which he played a disreputable part. As long as the power of
Athens remained intact he did not meddle in Greek affairs;
even the support which the Athenians in 413 BC gave to the
rebel Amorges in Caria would not have roused him, had not
the Athenian power been broken in the same year before
Syracuse. He 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; for this
purpose they 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. In 404 BC Darius II died after a reign
of nineteen years, and was followed by Artaxerxes II...
Darius III of Persia in Wikipedia
(Artashata) (c. 380–330 BC, Persian داریوش Dāriūš, pronounced
[dɔːriˈuːʃ]) was the last king of the Achaemenid Empire of
Persia from 336 BC to 330 BC. It was under his rule that the
Persian Empire was conquered during the Wars of Alexander the
Great (for more information on the name, see the entry for