…I (reigned 171–138 bce) and Artabanus II (reigned 128–124 bce), all of the Iranian Plateau and the Tigris-Euphrates valley came under Parthian control. The Parthians, however, were troubled by nomad attacks on their northeastern borders as well as attacks by the Scythians. Mithradates II the Great (reigned 123–88 bce), by…
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