The Histories · 5.49

However, Aristagoras the despot of Miletos arrived at Sparta while Cleomenes was reigning: and accordingly with him he came to speech, having, as the Lacedemonians say, a tablet of bronze, on which was engraved a map of the whole Earth, with all the sea and all the rivers. And when he came to speech with Cleomenes he said to him as follows: "Marvel not, Cleomenes, at my earnestness in coming hither, for the case is this.--That the sons of the Ionians should be slaves instead of free is a reproach and a grief most of all indeed to ourselves, but of all others most to you, inasmuch as ye are the leaders of Hellas. Now therefore I entreat you by the gods of Hellas to rescue from slavery the Ionians, who are your own kinsmen: and ye may easily achieve this, for the Barbarians are not valiant in fight, whereas ye have attained to the highest point of valour in that which relates to war: and…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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