An interesting anachronism appears in William Shakespeare's The Winter's Tale, which sheds light on the difference between the pagan setting of the Tale, and the Christianized setting of its writing. A jealous King Leontes demands that his newborn daughter, whom he credits to his wife's supposed lover, be put to death. His lords respond:
"On our knees we beg as recompence of our dear services past and to come, that you do change this purpose, which being so horrible, so bloody, must lead on to some foul issue. We all kneel."
Shakespeare is not accurately describing the attitude of the ancients towards female infanticide, which was easy going at least! Not only is there archeological evidence for the practice, infanticide is a common trope in Greco-Roman literature, such as Life of Romulus, and Daphne and Chloe -- never remarked, so far as I have read, as a horrible or evil practice.
Shakespeare generally makes credible allusion to Greco-Roman beliefs, but here he is writing from within a Christian worldview.