The text of Herodotus’ Histories cited throughout as Hdt. is the Oxford Classical Text of N. G. Wilson (Oxford, 2015). In discussing Presocratic fragments I make use of the standard text and numbering from Diels-Kranz’s sixth edition of Die Fragmente der Vorsokratiker (Berlin, 1951–2). Unless otherwise noted, translations of Greek and Latin are my own. I have benefitted from consulting D. Grene’s The History: Herodotus (Chicago, 1987) and the Laks-Most Loeb series edition, Early Greek Philosophy (Cambridge, MA, 2016). Ancient texts that I refer to are taken from the Oxford Classical Text editions; exceptions to this general practice are indicated.