The histories of Herodotus;

BOOK III
THALIA
AGAINST this Amasis, Cambyses, son of Cyrus, made
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war, leading with him both others, his own subjects,
and of the Grecians, Ionians, and ^Eolians. The cause
of the war was this : Cambyses, having sent a herald into
Egypt, demanded the daughter of Amasis ; and he made this
demand at the suggestion of an Egyptian physician, who out
of spite served Amasis in this manner, because, having selected
him out of all the physicians in Egypt, and torn him
from his wife and children, he had sent him as a present to
the Persians, when Cyrus, having sent to Amasis, required
of him the best oculist in Egypt. The Egyptian therefore,
having this spite against him, urged on Cambyses by his suggestions,
bidding him demand the daughter of Amasis, in
order that if he should comply he might be grieved, or if he
refused he might incur the hatred of Cambyses. But Amasis,
dreading the power of the Persians, and being alarmed, knew
not whether to give or to deny; for he was well aware that
Cambyses purposed to take her, not as his wife, but his mistress.
Having considered these things, he did as follows:
There was a daughter of Apries, the former king, very tall
and beautiful, the only survivor of the family ; her name was
Nitetis. This damsel, Amasis, having adorned with cloth of
gold, sent to Persia as his own daughter. After a time, when
Cambyses saluted her, addressing her by her father's name,
the damsel said to him : " O king, you do not perceive that
you have been imposed upon by Amasis, who, having dressed
me in rich attire, sent me to you, presenting me as his own
daughter; whereas, in truth, I am the daughter of Apries,
whom he, though he was his own master, put to death, after he
had incited the Egyptians to revolt." These words, and this
accusation, induced Cambyses, the son of Cyrus, being greatly
enraged, to invade Egypt. Such is the account the Persians
give. But the Egyptians claim Cambyses as their own, say-
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