Phraates II was a king of the Parthian Empire, ruling from around 138 to 128 BCE. He was the son of Phraates I and is known for his efforts to strengthen the empire and maintain its independence from external threats, particularly from the Seleucid Empire. His reign was marked by military campaigns and diplomatic relations with neighboring states. During his rule, Phraates II faced challenges, including internal strife and conflicts with the Romans. He is also noted for his attempts to consolidate power and improve the administration of the empire. His legacy is significant in the context of Parthian history and its interactions with surrounding cultures.