Agathyrsi
Agathyrsi (Greek: Ἀγάθυρσοι) were a people of Scythian, or mixed Dacian-Scythian origin, who in the time of Herodotus occupied the plain of the Maris (Mures), in the mountainous part of ancient Dacia now known as Transylvania, Romania. Their ruling class seems to have been of Scythian origin.
Archaeological evidence
The Scythian arrival to the Carpathian area is dated to 700 BC.
The Agathyrsi existence is archaeologically attested by the Ciumbrud inhumation type, in the upper Mureş area of the Transylvanian plateau. In contrast with the surrounding peoples who practiced incineration, the Ciumbrud people buried their dead. These tombs, containing Scythian artistic and armament metallurgy (e.g. acinaces), have moreover been dated to 550-450 BC — roughly the timeframe of Herodotus' writing. Archaeologists use the term "Thraco-Agathyrsian" to designate these characteristics, owing to the evident Thracian (or, more strictly speaking, Dacian) elements. At the time of Herodotus they were already absorbed by the native Dacians.