- published: 01 Feb 2013
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Parthia is a region of north-eastern Iran, best known for having been the political and cultural base of the Arsacid dynasty, rulers of the Parthian Empire.
The name "Parthia" is a continuation from Latin Parthia, from Old Persian Parthava, which was the Parthian language self-designator signifying "of the Parthians" who were an Iranian people.
Parthia roughly corresponds to the western half of Khorasan region in northeastern Iran. It was bordered by the Kopet Dag mountain range in the north and the Dasht-e-Kavir desert in the south. It bordered Media on the west, Hyrcania on the north west, Margiana on the north east, and Aria on the south east.
During Arsacid times, Parthia was united with Hyrcania as one administrative unit, and that region is therefore often (subject to context) considered a part of Parthia proper.
As the region inhabited by Parthians, Parthia first appears as a political entity in Achaemenid lists of governorates ("satrapies") under their dominion. Prior to this, the people of the region seem to have been subjects of the Medes, and 7th century BC Assyrian texts mention a country named Partakka or Partukka (though this "need not have coincided topographically with the later Parthia").
Osroes I of Parthia ruled the Parthian Empire c. 109–129. He succeeded his brother Pacorus II. For the whole of his reign he contended with the rival king Vologases III based in the east of Parthia.
Osroes invaded Armenia and placed first his nephew Axidares, and then his brother Parthamasiris on the Armenian throne. This enchroachment on the traditional sphere of influence of the Roman Empire — the two great empires had shared hegemony over Armenia since the time of Nero some 50 years earlier — led to a war with the Roman emperor Trajan.
In 113 Trajan invaded Parthia, marching first on Armenia. In 114 Parthamasiris surrendered and was killed. Trajan annexed Armenia to the Roman empire. Then he turned south into Parthia itself, taking the cities of Babylon, Seleucia and finally the capital of Ctesiphon in 116. He deposed Osroes I and put his own puppet ruler Parthamaspates on the throne. In Mesopotamia Osroes' brother Mithridates IV and his son Sanatruces II took the diadem and fought against the Romans, but Trajan marched southward to the Persian Gulf, defeated them, and declared Mesopotamia a new province of the empire. Later in 116, he crossed the Khuzestan mountains into Persia and captured the great city of Susa.