Analysis of information sources in references of the Wikipedia article "Byzantine Greeks" in English language version.
It is said that more than four thousand Latins of various age, sex, and condition were delivered thus to barbarous nations for a price. In such fashion did the perfidious Greek nation, a brood of vipers, like a serpent in the bosom or a mouse in the wardrobe evilly requite their guests—those who had not deserved such treatment and were far from anticipating anything of the kind; those to whom they had given their daughters, nieces, and sisters as wives and who, by long living together, had become their friends.
It is said that more than four thousand Latins of various age, sex, and condition were delivered thus to barbarous nations for a price. In such fashion did the perfidious Greek nation, a brood of vipers, like a serpent in the bosom or a mouse in the wardrobe evilly requite their guests—those who had not deserved such treatment and were far from anticipating anything of the kind; those to whom they had given their daughters, nieces, and sisters as wives and who, by long living together, had become their friends.