War between Greek Bactria and Parthia
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The war waged by Parthian ruler Mithridates against the Greco-Bactrian Kingdom leading to the Parthian conquest of Bactria's territory west of the Arius river.
Chronology
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- January 166 BC: Mithridates first expanded Parthia's control eastward by defeating King Eucratides of the Greco-Bactrian Kingdom. This gave Parthia control over Bactria's territory west of the Arius river, the regions of Margiana and Aria (including the city of Herat in 167 BC).