While little is written about Parthian-Scythian relations, not only did the Parthians share origins with the Scythians and cooperated militarily but social, cultural, and commercial interactions were likely as well. Essentially leading a life of nomadic tribes - riding horses, tending herds, and living in covered wagons - Scythian tribes are often mentioned in ancient sources. While their ascendancy in Central Asia spanned between the 7th and 3rd century BCE from areas around the Black Sea and the Caspian Sea, the extent of their territory ranged west into Thrace, then east across the steppe of Central Asia to the Altai Mountains of Mongolia. But sometime around 330 BCE, after the Scythian nadir, the Parthians would begin their ascendancy. Known as the Parni, and Scythians themselves, they moved south off the steppe, east of the Caspian Sea, into the Seleucid province of Parthia. Using Scythian military tactics, they would take over Parthia, and finally, the Seleucid Empire, and become known as Parthians.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/1653/parthian-scythian-relations/.