The History Of Herodotus Volume 1 of 2
Page: 17086. Now at dawn of day the six came to the place as they had agreed, riding upon their horses; and as they rode through by the suburb of the city, when they came near the place where the mare had been tied up on the former night, the horse of Dareios ran up to the place and neighed; and just when the horse had done this, there came lightning and thunder from a clear sky: and the happening of these things to Dareios consummated his claim, for they seemed to have come to pass by some design, and the others leapt down from their horses and did obeisance to Dareios.
87. Some say that the contrivance of Oibares was this, but others say as follows (for the story is told by the Persians in both ways), namely that he touched with his hands the parts of this mare and kept his hand hidden in his trousers; and when at sunrise they were about to let the horses go, this Oibares pulled out his hand and applied it to the nostrils of the horse of Dareios; and the horse, perceiving the smell, snorted and neighed.
88. So Dareios the son of Hystaspes had been declared king; and in Asia all except the Arabians were his subjects, having been subdued by Cyrus and again afterwards by Cambyses. The Arabians however were never obedient to the Persians under conditions of subjection, but had become guest-friends when they let Cambyses pass by to Egypt: for against the will of the Arabians the Persians would not be able to invade Egypt. Moreover Dareios made the most noble marriages possible in the estimation of the Persians; for he married two daughters of Cyrus, Atossa and Artystone, of whom the one, Arossa, had before been the wife of Cambyses her brother and then afterwards of the Magian, while Artystone was a virgin; and besides them he married the daughter of Smerdis the son of Cyrus, whose name was Parmys; and he also took to wife the daughter of Otanes, her who had discovered the Magian; and all things became filled with his power. And first he caused to be a carving in stone, and set it up; and in it there was the figure of a man on horseback, and he wrote upon it writing to this effect: "Dareios son of Hystaspes by the excellence of his horse," mentioning the name of it, "and of his horse-keeper Oibares obtained the kingdom of the Persians."
89. Having so done in Persia, he established twenty provinces, which the Persians themselves call satrapies; and having established the provinces and set over them rulers, he appointed tribute to come to him from them according to races, joining also to the chief races those who dwelt on their borders, or passing beyond the immediate neighbours and assigning to various races those which lay more distant. He divided the provinces and the yearly payment of tribute as follows: and those of them who brought in silver were commanded to pay by the standard of the Babylonian talent, but those who brought in gold by the Euboïc talent; now the Babylonian talent is equal to eight-and-seventy Euboïc pounds. 74 For in the reign of Cyrus, and again of Cambyses, nothing was fixed about tribute, but they used to bring gifts: and on account of this appointing of tribute and other things like this, the Persians say that Dareios was a shopkeeper, Cambyses a master, and Cyrus a father; the one because he dealt with all his affairs like a shopkeeper, the second because he was harsh and had little regard for any one, and the other because he was gentle and contrived for them all things good.