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Phraates I was a king of Parthia who reigned from approximately 176 to 171 BCE. He succeeded his father, Priapatius, and his reign marked a period of recuperation and expansion for the young Parthian kingdom.1

During his rule, Phraates I initiated military actions, including an attack on Media and the conquest of the Mardi tribe near the Caspian Sea. He also secured the strategic "Caspian Gates". Notably, Phraates I overturned Parthian tradition by designating his brother, Mithradates, as his successor, rather than his eldest son.1

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