The Histories
Book IV
Aristeas also, son of Caystrobius, a native of Proconnesus, says in the course of his poem that wrapt in Bacchic fury he went as far as the Issedones.
Above them dwelt the Arimaspi, men with one eye; still further, the gold-guarding griffins; and beyond these, the Hyperboreans, who extended to the sea.
Except the Hyperboreans, all these nations, beginning with the Arimaspi, were continually encroaching upon their neighbours.
Hence it came to pass that the Arimaspi drove the Issedonians from their country, while the Issedonians dispossessed the Scyths; and the Scyths, pressing upon the Cimmerians, who dwelt on the shores of the Southern Sea, forced them to leave their land.
Thus even Aristeas does not agree in his account of this region with the Scythians.
The regions beyond are known only from the accounts of the Issedonians, by whom the stories are told of the one-eyed race of men and the gold-guarding griffins.