Skyles conceived a desire to be initiated into the rites of Dionysos Bakcheios; and when he was about to begin the sacred mysteries, he saw the greatest vision. He had in the city of the Borysthenites a spacious house, grand and costly (the same house I just mentioned), all surrounded by sphinxes and griffins worked in white marble; this house was struck by a thunderbolt. And though the house burnt to the ground, Skyles none the less performed the rite to the end. Now the Skythians reproach the Greeks for this Bacchic revelling, saying that it is not reasonable to set up a god who leads men to madness.
So when Skyles had been initiated into the Bacchic rite, some one of the Borysthenites scoffed at the Skythians, `You laugh at us, Skythians, because we play the Bacchant and the god possesses us; but now this deity has possessed your own king, so that he plays the Bacchant and is maddened by the god. If you will not believe me, follow me now and I will show him to you.’ The leading men among the Skythians followed him, and the Borysthenite brought them up secretly onto a tower; from which, when Skyles passed by with his company of worshipers, they saw him raving like a Bacchant; thinking it a great misfortune, they left the city and told the whole army what they had seen. After this Skyles rode off to his own place; but the Skythians rebelled against him. They put at their head Octamasadas, grandson (on the mother’s side) of Teres.
Then Skyles, when he learned the danger with which he was threatened, and the reason of the disturbance, made his escape to Thrake. Octamasadas, discovering whither he had fled, marched after him, and had reached the Ister when he was met by the forces of the Thrakians. The two armies were about to engage, but before they joined battle, Sitalkes sent a message to Octamasadas to this effect, ‘Why should there be trial of arms betwixt thee and me? Thou art my own sister’s son, and thou hast in thy keeping my brother. Surrender him into my hands, and I will give thy Skyles back to thee. So neither thou nor I will risk our armies.’ Sitalkes sent this message to Octamasadas, by a herald, and Octamasadas, with whom a brother of Sitalkes had formerly taken refuge, accepted the terms. He surrendered his own uncle to Sitalkes, and obtained in exchange his brother Skyles. Sitalkes took his brother with him and withdrew; but Octamasadas beheaded Skyles upon the spot. Thus rigidly do the Skythians maintain their own customs, and thus severely do they punish such as adopt foreign usages.
– Herodotos, The Histories 4.79