The Histories · 4.9

Then when Heracles woke he sought for them; and having gone over the whole land, at last he came to the region which is called Hylaia; and there he found in a cave a kind of twofold creature formed by the union of a maiden and a serpent, whose upper parts from the buttocks upwards were those of a woman, but her lower parts were those of a snake. Having seen her and marvelled at her, he asked her then whether she had seen any mares straying anywhere; and she said that she had them herself and would not give them up until he lay with her; and Heracles lay with her on condition of receiving them. She then tried to put off the giving back of the mares, desiring to have Heracles with her as long as possible, while he on the other hand desired to get the mares and depart; and at last she gave them back and said: "These mares when they came hither I saved for thee, and thou didst give me…

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