Detail from a full-length bronze statue of a Parthian prince, Tehran Museum (photo AMW)
During the second millennium BC (between 2000 and 1000 BC) groups of animal-herders had moved down from the steppes of central Asia, and established themselves on the Iranian plateau. They became the Medes and the Persians. But many other Iranian peoples stayed on the steppes - becoming expert horsemen, and perfecting a nomadic lifestyle. The Greeks indiscriminately referred to all these peoples as "Scythians", while to the Persians they were known as Saka. There were many different nations, but all spoke Iranian languages related to Persian. During the Seleucid period, around 250 BC, another movement began. One of the nomadic horse-riding nations began filtering down into the area east of the Caspian Sea, in seach of more pasture. These were the Parni or Aparni, a branch of the semi-nomadic Dahae people. Deterred from taking on the powerful Bactrian kingdom, they infiltrated the satrapy known to the Greeks as Parthia, and so became known as Parthians. They were attracted to Hellenism, and soon absorbed the language and ethos of the sendentary Iranians of Chorasan - but their tribal organisation and nomadic customs remained characteristically Parthian throughout their half millennium of rule on the Plateau.
Independence and expansion
In 247 BC a bid for local independence from Seleucid control in Bactria further east inspired the Seleucid satrap of Parthia, Andragoras, to break free of the central government. This gave the Parthians themselves the idea of breaking free from Andragoras. A group of seven conspirators murdered Andragoras, and proclaimed one of their number, Arshak (Arsaces), as king of Parthia. Holy fire, kept burning for ever, was used at his coronation: the religion of Ahura Mazda perhaps symbolised his intention to revive past glories. Unlike in Bactria, this was a "nationalist" uprising: an Iranian people taking power for themselves. He quickly extinguished Greek rule in Parthia. The reconquest had begun. Arscaces ruled until about 217 BC, when his son Arsaces II succeeded (c217 - c191 BC).
A Roman historian wrote:
Arsaces became as memorable among the Parthians as Cyrus among the Persians, Alexander among the Greeks or Romulus among the Romans.Justin, Epitome of Pompeius Trogus
After a long period of peace with the Seleucids, their progress was challenged by Antiochus III in 209 BC, but his defeat by the Romans at Thermopylae in 191 BC ended his briefly successful attempt to revive Seleucid dominance. In any case Antiochus had de facto recognised the Parthian state.
A statuette of Athena found in the ruins of Nisa, Turkmenistan. Excavations there make it likely that Nisa (Mithradatkert) was the first Parthian capital, and the home base of the Arsacids.
Under king Farhad I (Phraates I, 176 - ?171 BC. Little is known about his reign), the Parthians extended their rule into Hyrcania, a base to attack the Persian heartlands from. The capital moved west to the Seleucid city of Hecatompylos in Hyrcania- the policy was to make use of the Greeks and what they'd built, not to eliminate them. He passed on the throne not to his son, as expected, but to his younger brother:
Mehrdad I (Mithridates I), who ruled from ?171 to 138 BC, was the most distinguished of the Parthian kings, transforming Parthia into a large and powerful empire. He first did a deal with independent Bactria, securing his rear. He then turned west. He took Ecbatana in 147 BC. Advancing into Mesopotamia, he took Babylon in 141 BC and finally the Seleucid capital - Seleuceia - in 139 BC. It was simple to mop up Media Atropatene, but Elymais and Characene on the Persian Gulf, though, were difficult, and Parthian rule over them was short-lived. He's referred to as "King of Kings" in a Babylonian document. But he still called himself "Greek-lover" on his coins (and so did his successors) - no doubt to reassure the many Greeks in the cities who were now his subjects.
During the reign of Farhad II (Phraates II, 138 - 127 BC) the Seleucids under Antiochus VII had one last try at beating back the Parthians. Temporary success was totally wiped out by Farhad II's victory at the Battle of Ecbatana (129 BC). The Seleucid army was annihilated, marking the end of their 150 year rule in Persia. Many of these Greeks were taken prisoner, and recruited into the Parthian army.
Trouble with the Saka
But he couldn't take Syria and finish the Seleucids off, because of events in the east. The Yuezhi, an Iranian tribe living in Mongolia, were under pressure, because of the expansion of a mysterious people called the Xiongnu. They threatened the Yuezhi, the Yuezhi threatened the Saka (another nomadic "Scythian" nation), and the Saka threatened Parthia. Farhad II' s brilliant idea of using the Saka to fight the Seleucids misfired - feeling they'd not been rewarded for their service, they went on a spree of destruction through the new Parthian domains. Meanwhile other Saka overwhelmed the Bactrian kingdom. Farhad II took them on, but lost, and was killed. The newly-enrolled Greek hoplites had preferred to join the Saka; unsurprisingly the Parthians decided they could fight better without Greeks in future. The next Arsacid, Ardvan I (Artabanus, 127 - 124 BC) spent his reign fighting the Saka, and was also killed in battle.
Mehrdad II (a long and important reign 123 - 88 BC).
In Mehrdad II (Mithridates II) the Arsacids produced a great leader. First he had to deal with Hyspaosines of Characene, who had overrun Mesopotamia, and occupied Seleuceia (121 BC) Then he neutralised the Saka problem by giving them somewhere to settle, out of the way in Arachosia/Drangistan (bestriding the modern Iran-Afghan border) in south-east Iran: modern Seistan (=Saka-stan, land of the Saka), which had been recovered from the now defunct Indian Maurya empire.
After consolidating Parthian control of their earlier winnings, Mehrdad II was crowned King of Kings (109 BC)- and now felt himself the true successor to the Achaemenids (even if he knew little or nothing about therm). The Parthians had an empire of their own. Mehrdad felt entitled to record his achievements, like Darius the Great, on a rock-face at Bisitun, just below the original. Persian became the official language instead of Greek, and the cult of Ahura Mazda began a revival. The Parthian centre began a move westward again, into Mesopotamia and Mehrdad II's expansion reached the Euphrates. In 113 BC he seized Dura-Europos on the eastern bank of the river. A new capital city was built at Ctesiphon, on the opposite bank of the Tigris to Seleuceia, to add to the other royal centres at Hecatompylus, Rhagae (Rayy near modern Tehran) and Ecbatana. Armenia (never properly part of the Seleucid empire) had become Parthian by 95 BC, as had the northern Mesopotamian territories of Adiabene, Gordyene and Osrhoene.
The Chinese emperor Wu
First contact with China
Mehrdad I welcomed Zhang Qian (Chiang-k'ien), ambassador from the Han emperor Wu (aka Han Wudi), who ruled from 141 to 87 BC. Zhang Qian opened up the caravan route between China and the west which is now known as the "Silk Road". The most important 1500 mile stretch through central Asia was controlled by the Sogdians, an Iranian people with their capital at Maracanda (Samarkhand).
First contact with Rome
Mehrdad's capture of Dura Europos, a major Seleucid city in Syria, had an ominous consequence. A first meeting took place between future deadly enemies. Present on this magnificent occasion (around 92 BC) were the Parthian king's representative Orobazos, and the Roman governor of Cilicia Lucius Cornelius Sulla. Both perhaps had a common interest then in fears (justified) about the intentions of Mithridates VI of Pontus. Initial contact was friendly and non-confrontational. A treaty was concluded, probably recognising the Euphrates, which both sides had reached in their respecive expansions, as a frontier.
With contacts established with both Rome and China, the Parthian empire was now a force to be reckoned with. They controlled and profited hugely from the new trade route between east and west.