Another topic consists in making use of errors committed, for purposes of accusation or defence. For instance, in the Medea of Carcinus, some accuse Medea of having killed her children,--at any rate, they had disappeared; for she had made the mistake of sending them out of the way. Medea herself pleads that she would have slain, not her children, but her husband Jason; for it would have been a mistake on her part not to have done this [slay Jason], if she had done the other [slain the children].

Carcinus - an early fourth-century tragic poet cited often by Aristotle