The Histories · 8.116

Here also a Thracian, the king of the Bisaltians and of the Crestonian land, did a deed of surpassing horror; for he had said that he would not himself be subject to Xerxes with his own will and had gone away up to Mount Rhodope, and also he had forbidden his sons to go on the march against Hellas. They however, either because they cared not for his command, or else because a desire came upon them to see the war, went on the march with the Persian: and when they returned all unhurt, being six in number, their father plucked out their eyes for this cause.

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