Strabo Geography 10.3.5

[5] But though Ephorus is such, still he is better than others. And Polybius ¹ himself, who praises him so earnestly, and says concerning the Greek histories that Eudoxus ² indeed gave a good account, but Ephorus gave the best account of the foundings of cities, kinships, migrations, and original founders, “but I,” he says, ³ But assuredly you, Polybius, who introduce “popular notions” ⁴ concerning distances, not only in dealing with places outside of Greece, but also when treating Greece itself, must also submit to an accounting, not only to Poseidonius, ⁵ and to Apollodorus, but to several others as well. One should therefore pardon me as well, and not be vexed, if I make any mistakes when I borrow from such writers most of my historical material, but should rather be content if in the majority of cases I improve upon the accounts given by others, or if I add such facts as have elsewhere, owing to lack of knowledge, been left untold.