c.234 - 305
Porphyrios was born in Palestine, studied in Athens, and then joined the Neo-Platonic group of Plotinus in Rome.
His book 'Introduction to Categories' descirbed how all qualities persons attribute to things may be classified. As philosopher Porphyrios declared the salvation of the soul as the ultimate purpose of philosophy.
His Isagoge, or Introduction, is an introduction to logic and philosophy, and in Latin translation it was the standard textbook on logic throughout the Middle Ages.
In addition, through several of his works, most notably 'Against the Christians', he was involved in a controversy with a number of early Christians.
www link :
Porphyry: Against the Christians