King Phraates I of Parthia, son of Phriapatius, ruled the Parthian Empire c. 176–171 BC. He subdued the Mardi, a mountainous tribe in the Elburz. He died young, and appointed as his successor not one of his sons, but his brother Mithradates.

References

• Junianus Justinus, Historiarum Philippicarum, xli, 5
• Isidore of Seville, Chronica, 7