What is "themistius"

Themistius (, Themistios; 317, Paphlagonia – c. 390 AD, Constantinople), named (eloquent), was a statesman, rhetorician, and philosopher. He flourished in the reigns of Constantius II, Julian, Jovian, Valens, Gratian, and Theodosius I; and he enjoyed the favour of all those emperors, notwithstanding their many differences, and the fact that he himself was not a Christian. He was admitted to the senate by Constantius in 355, and he was prefect of Constantinople in 384 on the nomination of Theodosius. Of his many works, thirty-three orations of his have come down to us, as well as various commentaries and epitomes of the works of Aristotle.