Histories

From there, Darius set out and came to another river called Artescus, which flows through the country of the Odrysae; and having reached this river, he pointed out a spot to the army, and told every man to lay one stone as he passed in this spot that he pointed out. After his army did this, he led it away, leaving behind there great piles of stones.

But before he came to the Ister, he first took the Getae, who pretend to be immortal. The Thracians of Salmydessus and of the country above the towns of +Apollonia [14.5833,38.0167] (Perseus) Apollonia and Mesambria, who are called Cyrmianae and Nipsaei, surrendered without a fight to Darius; but the Getae resisted stubbornly, and were enslaved at once, the bravest and most just Thracians of all.