Mithridates I was a king of the Parthian Empire, ruling from around 171 to 138 BCE. He is known for expanding the empire's territory and consolidating its power in the region. His reign marked a significant period of growth for the Parthians, as he successfully engaged in military campaigns against neighboring states. Under Mithridates I, the Parthian Empire established itself as a major power in the ancient world, rivaling the Roman Republic. He is often credited with enhancing the cultural and political influence of the Parthians, setting the stage for future rulers to build upon his achievements.