Porphyry of Tyre , Porphyrios, AD 234–c. 305) was a Neoplatonic

Neoplatonism

Neoplatonism , is the modern term for a school of religious and mystical philosophy that took shape in the 3rd century AD, based on the teachings of Plato and earlier Platonists, with its earliest contributor believed to be Plotinus, and his teacher Ammonius Saccas...

 philosopher who was born in Tyre. He edited and published the Enneads

Enneads

The Six Enneads, sometimes abbreviated to The Enneads or Enneads , is the collection of writings of Plotinus, edited and compiled by his student Porphyry . Plotinus was a student of Ammonius Saccas and they were founders of Neoplatonism...

, the only collection of the work of his teacher Plotinus

Plotinus

Plotinus was a major philosopher of the ancient world. In his system of theory there are the three principles: the One, the Intellect, and the Soul. His teacher was Ammonius Saccas and he is of the Platonic tradition...

. He also wrote many works himself on a wide variety of topics. His Isagoge

Isagoge

The Isagoge or "Introduction" to Aristotle's "Categories", written by Porphyry in Greek and translated into Latin by Boethius, was the standard textbook on logic for at least a millennium after his death. It was composed by Porphyry in Sicily during the years 268-270, and sent to Chrysaorium,...

, or Introduction, is an introduction to logic and philosophy, and in Latin translation it was the standard textbook on logic throughout the Middle Ages

Middle Ages

The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

.