What is "arimaspi"

The Arimaspi were a tribe of legendary one eyed people of northern Scythia who lived in the foothills of the Riphean Mountains, variously identified with the Ural Mountains or the Carpathians. All tales of their struggles with the gold-guarding griffins in the Hyperborean lands near the cave of Boreas, the North Wind (Geskleithron), had their origin in a lost work by Aristeas, reported in Herodotus.