The Histories · 3.133

Not long time after this another thing came to pass which was this:—Atossa the daughter of Cyrus and wife of Dareios had a tumour upon her breast, which afterwards burst and then was spreading further: and so long as it was not large, she concealed it and said nothing to anybody, because she was ashamed; but afterwards when she was in evil case, she sent for Demokedes and showed it to him: and he said that he would make her well, and caused her to swear that she would surely do for him in return that which he should ask of her; and he would ask, he said, none of such things as are shameful.

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