Isagoge

Isagoge, also known as "Isagoge ad Porphyrium," is a philosophical work written by the ancient philosopher Porphyry in the 3rd century CE. The title translates from Greek as "Introduction" or "Access," and the work serves as an introduction to Aristotle's categories and a commentary on the nature of universals, species, and individuals. Porphyry's Isagoge focuses on the classification of beings and the systematic organization of knowledge.