Saint Nemesius of Alexandria

Nemesius of Emesa (Ancient Greek: Νεμέσιος Ἐμέσης; Latin: Nemesius Emesenus; fl. c. AD 390) was a Christian philosopher, and the author of a treatise Περὶ φύσεως ἀνθρώπου or De natura hominis ("On Human Nature"). According to the title of his book, he was the bishop of Emesa (modern-day Homs, Syria). His book is an attempt to compile a system of anthropology from the standpoint of Christian philosophy; it was very influential in later Greek, Arabic and Christian thought. Nemesius was also a physiological theorist. He based much of his writing on previous work of Aristotle and Galen, and it has been speculated that he anticipated William Harvey's discovery of the circulation of blood. Other views included a five-theory hierarchy of divine providence. These theories are developed from an earlier Platonic theory. Nemesius was one in a succession of advocates, from Herophilus and Erasistratus onward, of the idea that different cavities of the brain were responsible for different functions. His Doctrine of Ventricle Localisation of Mental Functioning is a reconciliation of Platonic doctrines on the soul with Christian philosophy and also emphasized Greek scientific interpretation and knowledge of the human body. Little information is available on Nemesius' life except that he was the bishop of Emesa. Even his date is uncertain, though a rough indication is given by some internal evidence that points to a time after the Apollinarian controversy and before the strife that is connected to Eutyches and Nestorius (the second quarter of the fifth century). There is evidence that supports that he was well read in the writings of Galen and may have had some medical training. What remains very unclear in his writing is the interplay between the Christianity of his published writings and the Hellenism of his education. It is noteworthy that a bishop should be so interested in Hellenistic thought.