Acatziri
An old theory of 19th century writers (Latham, V. St. Martin, Rambaud, Newman) which, according to the 1911 Encyclopædia Britannica, is based on 'less convincing proof', suggested an identification of the Agathyrsi with the later Agatziri or Akatziroi first mentioned by Priscus in Vol XI, 823, Byzantine History, who described them leading a nomadic life on the Lower Volga, and reported them as having been Hunnic subjects before the time of Attila. This older theory is not mentioned at all by modern scholars Helfen or Golden. According to E.A. Thompson, the conjecture that connects the Agathyrsi with Akatziri should be rejected outright.
The Acatziri were a main force of the Attila's army in 448. Attila appointed Karadach or Curidachus as the Akatzirs' chieftain. (Thompson, p. 107).
Jordanes, who quotes Priscus in Getica, located the Acatziri to the south of the Aesti (Balts) — roughly the same region as the Agathyrsi of Transylvania — and he described them as "a very brave tribe ignorant of agriculture, who subsist on their flocks and by hunting."
The Encyclopædia Britannica 1897 and 1911 editions consider the Acatziri to be precursors of the Khazars of later antiquity, although modern scholars like Professor Peter Golden, E.A. Thompson and Maenchen-Helfen consider this theory to be nothing more than conjecture and Thompson has rejected it outright. There does not seem to be any modern reputable scholar that holds such a theory as factual though no reasons have been given.
Read more about this topic: Agathyrsi