The church fathers made a significant contribution to the almost complete preservation of the Placita of Aëtius. In this chapter I investigate what motivated them to use it so extensively. I first introduce the Placita, outlining six features that give this work a distinctive mode of ordering knowledge. Philo of Alexandria, the first of eight authors to be discussed, is not a Christian. Nevertheless his approach to the variety of philosophical doctrines recorded in the antecdent tradition of the Placita will be crucial for his Christian successors. These commence with Athenagoras and Hermias, followed by three fourth-century authors, Eusebius, Pseudo-Justin and Nemesius, and conclude with two fifth-century writers, Cyril of Alexandrian and Theodoret. Although the Placita bring order into the vast body of contradictory doctrines put forward by the philosophers, this ‘structured disorder’ is in sharp contrast to the ordering of Christian knowledge, which is presented as being founded on a unified body of revealed truth.

The epilogue explores the evidence for dissection and anatomical literature in Late Antiquity. It addresses the seeming hiatus in anatomical activity after Galen, introducing the topic via Vesalius’ retrospective thoughts, which blame Galen’s enervating authority. It starts with fourth-century evidence, pictorial and textual, observing that Galen, while a dominant voice, was not the lone authority; major figures considered include Vindicianus, Nemesius of Emesa, Oribasius, and Gregory of Nyssa. It then turns to the fifth to seventh centuries, addressing the medical curriculum in Alexandria and the evidence from Stephanus of Athens and Paul of Aegina. Finally, it contrasts the absence of evidence for anatomical activity in the Late Antique West after the seventh century with the modest but more vibrant interest in the East, addressing the question of whether human dissection reemerged as an option in Byzantium in this period; major figures considered include Meletius, Theophilus Protospatharius, Michael Choniates, and George Tornikios. The epilogue ends with Hunayn ibn Ishaq and his Syriac and Arabic translations, representing the beginning of the next chapter in anatomical history.

This chapter looks at the manner in which Calcidius presents allusions to Christian views (in comparison with known Christian authors of the era), his use of the "Hebrews," and his minimal reliance on Origen.

This chapter argues that Providence is one of the key themes of the commentary, and examines how Calcidius (1) harmonizes Providence and fate with human free will through a notion of hypothetical necessity; and (2) refutes determinist positions, among which the Stoic view.