In 155 B.C. Athens sent an embassy to Rome to mediate in the matters raised by the Athenian intervention in the city of Oropos. Although the senate not long before has expelled philosphers and rhetors, they decided to entrust negotiations to the academic Carneades, the stoic Diogenes and the peripatetic Critolao. We know nothing of the role played by the latter two, who in the testimonials that we have either do not appear or are merely mentioned in passing, perhaps because (...) only that which is scandalous tends to be remembered o perhaps because they were not fortunate enough to have Cicero notice them. We are also fortunate that Lactantius conserves parts of the Ciceronian text that otherwise would have been lost. The present paper addresses the relations and interrelations among these three levels of readings: the discourses of Carneades in favor of justice and injustice, the recreation of the discourse on injustice that Cicero puts in the mouth of Philo, and the fragments of Lactantius that allows us to complete the prior two discourses. (shrink)