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satrap, who had already begun his own revolt against the Seleucids.
Arsaces defeated the satrap. This gave him control over all of Parthia.
He then moved west and took control of the neighboring satrap, Hyrca-
nia. For a time, the Seleucids gained the upper hand, forcing Arsaces to
flee Parthia. But he regrouped his forces and won back the territory.
Under Mithridates I (r. 171–138 b.c.e.), Parthia emerged as a true
power. Mithridates took the throne in 171 b.c.e., and within several
years had expanded his empire into parts of Bactria. Around 148 b.c.e.,
he pushed westward and took Media and then advanced on Babylo-
nia. As his empire grew, however, Mithridates struggled to control it.
When nomads struck from the northeast, he had to send troops there
to protect his borders. This gave the Seleucids the chance to retake
Mesopotamia.
looKing BaCK, moving foRWaRd
Mithridates died in 138 b.c.e. His successors would continue to strug-
gle with the same problems he had faced: nomads on one side and the
Seleucids on the other. Scyths who were forced out of their lands by
Central Asian nomads rampaged across Parthia. At one major battle
around 128 b.c.e. they defeated the Parthians.
The Seleucids also made one last attempt to regain Babylonia. The
Arsacids, however, asserted their control there. They were also finally
able to coexist with the Scyths. The Scyths eventually settled in lands
near modern-day Pakistan and became known as the Indo-Parthians.
In 123 b.c.e., Mithridates II (r. ca. 123–87 b.c.e.) came to power.
He was the first Arsacid king to make a link between his family’s rule
and the Achaemenids of old. Mithridates took the title Great King, and
he left carvings documenting his deeds at Behistun, just as Darius the
Great had done four centuries earlier. But Mithridates, and the Arsac-
ids who followed him, never built a strong central government the way
Darius and his successors had. Local rulers throughout the Parthian
Empire had a great deal of freedom, and nobles had a say in choosing
the new kings.
Mithridates II strengthened Parthia’s rule on both its eastern
and western borders. His conquests extended Parthian power north
and west of Babylonia—parts of Mesopotamia it had not controlled
before. He founded the city of Ctesiphon, near Babylon, and within
several decades it became the new Parthian capital. This location in
t h e n e w p e r s i a n E m p i r e s
History Through
Coins
Coins minted by the Par-
thian kings offers some
of the best historical
evidence of their reigns.
The coins help historians
learn the names and
dates of the rulers. The
coins also have images
of the kings’ faces. Par-
thian coins are still being
uncovered by archaeolo-
gists working in Iran and
neighboring countries.
They offer new clues
about the empire’s his-
tory. The coins are also
popular with collectors,
which has led to some
modern criminals creat-
ing counterfeit coins. In
2001, a coin expert in
England declared that
some gold and silver
coins said to be from Par-
thia were actually fake.