The Parthian–Bactrian War refers to the invasion of the Greco-Bactrian Kingdom by Mithridates I of Parthia in 150s BC, which ended with a Parthian victory and annexation of Western Bactria to the new emerging Iranian power, the Parthian Empire.[1][2] This war left the Bactrian Kingdom very weakened and open to nomadic invasions, which eventually led to rise of the Kushan Empire in Bactria.