Fragments of the Philosophical Poets

...with one another, the Medes and the Lydians, while Cyaxares, the father of Astyages, was king of the Medes, and Alyattes was king of the Lydians... There are those who place the dates around the 50th Olympiad [580–577 BCE] (we shall record the ages of the Seven Sages; for Thales, the eldest of those mentioned, lived around the 50th Olympiad). Pliny, Natural History II 53: "Among the Greeks, however, Thales of Miletus first of all investigated [the reason for eclipses] in the fourth year of the 48th Olympiad [585/4 BCE], predicting the solar eclipse that occurred when Alyattes was king, 170 years after the founding of the city." Eusebius, Chronicle (Jerome): "A solar eclipse occurred, which Thales had predicted would happen, and Alyattes and Astyages fought a battle in the year of Abraham 1432 [585 BCE]."

6. HERODOTUS I 75: When Croesus arrived at the Halys river, as I say, he moved his army across by the existing bridges; but as the common story of the Greeks goes, Thales the Milesian moved them across. For when Croesus was at a loss as to how his army would cross the river... it is said that Thales, who was present in the camp, made the river flow on the left side of the army instead of on the right, and he did it this way: starting above the camp, he dug a deep, crescent-shaped canal so that the camp might be behind it, and by diverting the river from its old course into the canal, it bypassed the camp and flowed back into its old channel. As soon as the river was split, it became fordable on both sides.

7. EUSEB. Chronicle in Greek, in Cyril, Against Julian I p. 12: In the 35th Olympiad [640–637 BCE] Thales of Miletus is said to have been the first natural philosopher, and they say his life extended until the 58th Olympiad [548–545 BCE].

8. Paris Selection of Histories [Cramer An. Par. II 263]: In the sixth year of Hezekiah: "During these times, Thales of Miletus died in Tenedos, and the Sibyl of Erythrae became known."