Nemesius

Nemesius of Emesa (; ; 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.