The Dahae (Latin; Greek ) were a confederacy of three tribes who lived in the region to the immediate east of the
Caspian Sea. They spoke an
Eastern Iranian language.The first dateable mention of this nomad confederacy appears in the list of nations of
Xerxes' Daeva inscription. In this list of the peoples and provinces of the
Achaemenid Empire, the Dahae are identified in
Old Persian as Dāha and are immediately followed by a "
Saka" group, who are listed as being neighbors of the Dāha. Unclear is however whether the Dahae are also the *Dāha people (or *Dåŋha, only attested in the feminine Dahi) of the
Avestan Yasht 13.144. An etymological relationship "is not proof that the two names refer to the same ethnic group."
See more at Wikipedia.org...