The History Of Herodotus Volume 1 of 2
Page: 22086. These measurements I have made as follows:—a ship completes on an average in a long day a distance of seventy thousand fathoms, and in a night sixty thousand. Now we know that to the river Phasis from the mouth of the Sea (for it is here that the Pontus is longest) is a voyage of nine days and eight nights, which amounts to one hundred and eleven myriads 85 of fathoms; and these fathoms are eleven thousand one hundred furlongs. Then from the land of the Sindians to Themiskyra on the river Thermodon (for here is the broadest part of the Pontus) it is a voyage of three days and two nights, which amounts to thirty-three myriads 86 of fathoms or three thousand three hundred furlongs. This Pontus then and also the Bosphorus and the Hellespont have been measured by me thus, and their nature is such as has been said: and this Pontus also has a lake which has its outlet into it, which lake is not much less in size than the Pontus itself, and it is called Maiotis and "Mother of the Pontus."
87. Dareios then having gazed upon the Pontus sailed back to the bridge, of which Mandrocles a Samian had been chief constructor; and having gazed upon the Bosphorus also, he set up two pillars 8601 by it of white stone with characters cut upon them, on the one Assyrian and on the other Hellenic, being the names of all the nations which he was leading with him: and he was leading with him all over whom he was ruler. The whole number of them without the naval force was reckoned to be seventy myriads 87 including cavalry, and ships had been gathered together to the number of six hundred. These pillars the Byzantians conveyed to their city after the events of which I speak, and used them for the altar of Artemis Orthosia, excepting one stone, which was left standing by the side of the temple of Dionysos in Byzantion, covered over with Assyrian characters. Now the place on the Bosphorus where Dareios made his bridge is, as I conclude, 8701 midway between Byzantion and the temple at the mouth of the Pontus.
88. After this Dareios being pleased with the floating bridge rewarded the chief constructor of it, Mandrocles the Samian, with gifts tenfold; 88 and as an offering from these Mandrocles had a painting made of figures to present the whole scene of the bridge over the Bosphorus and king Dareios sitting in a prominent seat and his army crossing over; this he caused to be painted and dedicated it as an offering in the temple of Hera, with the following inscription:
"Bosphorus having bridged over, the straits fish-abounding, to Hera Mandrocleës dedicates this, of his work to record; A crown on himself he set, and he brought to the Samians glory, And for Dareios performed everything after his mind."
89. This memorial was made of him who constructed the bridge: and Dareios, after he had rewarded Mandrocles with gifts, passed over into Europe, having first commanded the Ionians to sail into the Pontus as far as the river Ister, and when they arrived at the Ister, there to wait for him, making a bridge meanwhile over the river; for the chief of his naval force were the Ionians, the Aiolians and the Hellespontians. So the fleet sailed through between the Kyanean rocks and made straight for the Ister; and then they sailed up the river a two days' voyage from the sea and proceeded to make a bridge across the neck, as it were, of the river, where the mouths of the Ister part off. Dareios meanwhile, having crossed the Bosphorus on the floating bridge, was advancing through Thrace, and when he came to the sources of the river Tearos he encamped for three days.