The Dahae had originally lived between the Jaxartes in the 4th-century BC, but gradually moved southward, possibly in the early 3rd-century BC. They first migrated southeast to Bactria, but were driven away, and as a result changed their course to the west. They gradually started settling in Parthia, a region in the south-eastern part of the Caspian Sea, that almost corresponded to present-day Khorasan Province of Iran and southern Turkmenistan. The region was then under the rule of the Seleucids. By 282/1 BC, Parthia was under considerable Parni influence. The Parni were not the only to migrate to Parthia, as the region was constantly receiving new waves of Iranian migrants from the north.
The Dahae had originally lived between the Jaxartes in the 4th-century BC but gradually moved southward possibly in the early 3rd-century BC They first migrated southeast to Bactria but were driven away and as a result changed their course to the west They gradually started settling in Parthia a region in the south-eastern part of the Caspian Sea that almost corresponded to present-day Khorasan Province of Iran and southern Turkmenistan The region was then under the rule of the Seleucids By 282/1 BC Parthia was under considerable Parni influence The Parni were not the only to migrate to Parthia as the region was constantly receiving new waves of Iranian migrants from the north