The Histories · 4.93

But before he came to the Ister he conquered first the Getai, who believe in immortality: for the Thracians who occupy Salmydessos and are settled above the cities of Apollonian and Mesambria, called the Kyrmianai and the Nipsaioi, delivered themselves over to Dareios without fighting; but the Getai, who are the bravest and the most upright in their dealings of all the Thracians, having betaken themselves to obstinacy were forthwith subdued.

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