Plotinus' Enneads: How Porphyry Shaped 54 Treatises into Six Books of Nine

Who wrote the texts, who arranged them

According to the Internet Encyclopedia of Philosophy, Plotinus’ work did not come down to us as a book written for publication: it is a collection of treatises that his student Porphyry gathered and edited in the years after the philosopher’s death, in 270 CE, in Campania. Plotinus had started writing late, at forty-nine, pushed by the same students who attended his lectures, as Encyclopedia.com recounts. Over the following seventeen years he put 54 treatises into writing, most of them in his last seven or eight years, according to the Wikipedia entry on Plotinus. Porphyry put in a long stretch of work to prepare those texts for publication, which arrived only around 300 CE, roughly thirty years later. The result of that work is the Enneads, the name under which the collection has reached us.

Why they are called Enneads

The name describes the shape of the collection, not its content. Porphyry sorted Plotinus’ 54 treatises into six groups of nine, and Ennead is simply the Greek term for that number. To make the scheme of six groups of nine work, the Internet Encyclopedia of Philosophy notes, Porphyry sometimes split into two or more treatises a text that Plotinus had originally conceived as a single piece. Porphyry then spread the six Enneads across three volumes: the first held the first through third Enneads, the second the fourth and fifth, and the third the sixth Ennead on its own, according to the Wikipedia entry on the Enneads.

Worked example: anyone looking up a passage in a critical edition of the Enneads finds it marked with three numbers, not a title. IV.8.1, for instance, points to the first chapter of the eighth treatise of the fourth Ennead. It is the citation system Porphyry fixed when he prepared the edition, around 300 CE.

The themes, Ennead by Ennead

The first Ennead gathers the treatises on ethics and human life. The second and third bring together the writings on nature and the physical world. The fourth is devoted to the soul, the fifth to knowledge and the intelligible world, that is the Intellect. The sixth centers on the One, the principle from which everything derives, more basic even than being itself.

Those themes, already seen Ennead by Ennead, are also the structure Porphyry used to organize the whole collection, as the Wikipedia entry on the Enneads notes. Anyone approaching ancient Greece for the first time, along with the debates that ran from Socrates to the Sophists, finds in the Enneads a systematic treatise, written for students who already knew the material discussed at Plotinus’ school. The collection became the main reference point for the school of thought built around Plotinus, Neoplatonism. The movement stayed alive well into the later Roman Empire, during the decades Plotinus spent teaching in Rome.

From scattered treatises to a standard text

The Christian Classics Ethereal Library, which holds a digital copy, describes the Enneads simply as the writings of Plotinus gathered, arranged and edited by Porphyry. It is a minimal definition, but a useful one: without a student’s editorial work, those 54 treatises would have stayed separate texts, rather than a work that can be cited chapter by chapter through the reference system Porphyry fixed in his edition around 300 CE.