Porphyry

Porphyry of Tyre (; Greek: Πορφύριος, Porphýrios; Arabic: فرفوريوس‎, Furfūriyūs; c. 234 – c. 305 AD) was a Neoplatonic philosopher who was born in Tyre, in the Roman Empire. He edited and published the Enneads, the only collection of the work of his teacher Plotinus. His commentary on Euclid's Elements was used as a source by Pappus of Alexandria.He also wrote many works himself on a wide variety of topics. His Isagoge, or Introduction, is an introduction to logic and philosophy, and in the Latin and Arabic translations it was the standard textbook on logic throughout the Middle Ages. In addition, through several of his works, most notably Philosophy from Oracles and Against the Christians, which was banned by emperor Constantine the Great, he was involved in a controversy with a number of early Christians.