Porphyry (philosopher)

Porphyry of Tyre (CE 234–c.

305) is a Neoplatonic philosopher who was born in Tyre.

He edits and publishes the Enneads, the only collection of the work of his teacher Plotinus.

He also writes many works himself on a wide variety of topics.

His Isagoge, or Introduction, is an introduction to logic and philosophy, and in Latin translation it is 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, he is involved in a controversy with a number of early Christians, and his commentary on Euclid's Elements is used as a source by Pappus of Alexandria.

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