Plotinus — Ilissus

About Plotinus

Plotinus (c. 204/5–270 CE) was born in Roman Egypt, studied philosophy in Alexandria for eleven years under Ammonius Saccas, and after a brief and ill-fated journey eastward with the army of Gordian III, settled in Rome around 244 CE. There, in a circle of senators, women of standing, and serious students of philosophy, he taught for the rest of his life. He wrote nothing for the first decade of teaching. Only at age 49 did he begin to compose treatises — short answers, originally, to questions raised in his seminars.

Porphyry tells us that Plotinus "was ashamed of being in the body" — he refused to discuss his ancestry, birthplace, or parents, and would not sit for a portrait. When the painter Carterius was proposed, Plotinus replied: "Is it not enough to carry the image in which nature has enclosed us?" Amelius eventually arranged for an artist to attend lectures and paint from memory.

His prose is famously difficult. Plotinus was nearsighted, disliked correcting what he had written, and never reread his work. The treatises preserve the urgency of live thinking: long sentences, sudden shifts, and strikingly intimate appeals to the reader. Porphyry reports that during their six years together, Plotinus achieved mystical union with the One four times — a detail that gives lived weight to the treatises on henosis (mystical union).

His student Porphyry of Tyre (c. 234–c. 305 CE) edited the corpus around 301 CE, some thirty years after Plotinus' death. Porphyry made two editorial decisions that shape every reader's experience. First, he abandoned chronological order in favor of a thematic ascent — from ethics to cosmos to soul to intellect to the One. Second, he forced the 54 treatises into six groups of nine (an ennead): six being a "perfect" number and nine being three squared, both Pythagorean numerological favorites. Where the count fell short, he split single treatises in two; where it ran over, he combined what had been independent. The result is elegant and artificial in equal measure.

Porphyry also wrote a short biography, On the Life of Plotinus and the Order of His Books, prefixed to the Enneads. It is our only source for the chronology — and indispensable. Three compositional periods are marked: Early (treatises 1–21), before Porphyry arrived (253–263); Middle (22–38), during Porphyry's six years (263–268); and Late (39–54), after Porphyry's departure (268–270).

One consequence of Porphyry's rearrangement is that the Großschrift — Plotinus' longest single continuous work — was broken into four separate treatises scattered across three enneads. Originally composed as one sustained argument (treatises 30–33 in chronological order), it should be read in sequence: III.8 On nature, contemplation, and the One → V.8 On the intelligible beauty → V.5 That the intelligibles are not outside intellect → II.9 Against the Gnostics. The arc moves from nature's unconscious contemplation upward through the radiant beauty of the intelligible realm and the identity of Forms with Intellect, culminating in a polemical defense of the cosmos' goodness against Gnostic world-rejection.

Life & works

c. 204 CE

Born in Lycopolis, Roman Egypt

232

Begins study with Ammonius Saccas in Alexandria

243

Joins Gordian III's Persian campaign; the emperor dies in Mesopotamia under disputed circumstances

244

Settles in Rome; begins teaching. Enjoys the patronage of Emperor Gallienus and his wife Salonina

253

First treatises composed (early period begins)

I.6 On beauty — his very first written work

263

Porphyry joins the school (middle period begins)

The great works: III.7 On eternity and time, III.8–V.8–V.5–II.9 (the Großschrift)

c. 265

Platonopolis proposed — petitions Emperor Gallienus to found a city in Campania governed by Plato's Laws; the project is blocked by court opposition

268

Porphyry departs to Sicily (late period begins)

VI.7, VI.8, I.7 — the final ambitious treatises

270 CE

Dies in Campania, age ~66. His last words to the physician Eustochius: "Strive to give back the Divine in yourselves to the Divine in the All"

c. 301

Porphyry edits and publishes the Enneads

Order by:

The philosophers, schools, and students who shaped and were shaped by the Enneads. Plotinus rarely names his opponents, but he is always in dialogue — knowing whom he is reading sharpens every page.

Plato

Platonism

The Athenian philosopher (c. 428–348 BCE) and founder of the Academy. Plotinus considers himself simply an exegete of Plato, reading the dialogues as a single coherent system rather than a collection of independent inquiries. The Parmenides supplies the doctrine of the One, the Timaeus the structure of the cosmos, the Symposium and Phaedrus the account of beauty and desire, Republic VI–VII the Form of the Good, and the Sophist the five greatest genera that organize Intellect. Plotinus treats apparent tensions between dialogues not as contradictions but as different perspectives on one truth.

Plotinus' view: The infallible master — Plotinus never criticizes Plato by name, and where Plato seems obscure or incomplete, Plotinus assumes the fault lies with the reader, not the text. His entire philosophical project is framed as the recovery of what Plato truly meant.

Aristotle

Peripatetic

Plato's most famous student (384–322 BCE), founder of the Lyceum. Both Plotinus and Aristotle passed through the intellectual world of Alexandria, and Plotinus' teacher Ammonius Saccas is said to have reconciled the two traditions. Plotinus has absorbed Aristotle deeply — the act–potency distinction, the concept of energeia (actuality), the analysis of substance — often using Aristotelian terminology to build un-Aristotelian conclusions. Yet he attacks Aristotle's ten categories as inadequate to intelligible reality (VI.1–3), rejects the definition of soul as entelechy of the body (IV.7), and dismisses Aristotle's unmoved mover as too thin a theology.

Plotinus' view: A brilliant colleague who went wrong at decisive points — Plotinus respects Aristotle's analytical power but treats him as a Platonist who lost his nerve, abandoning the transcendent Forms for an immanent metaphysics that cannot account for the soul's highest life.

The Stoics

Stoicism

The dominant philosophical school of the Hellenistic and Roman periods, founded by Zeno of Citium (c. 334–262 BCE) and systematized by Chrysippus (c. 279–206 BCE). By Plotinus' day, Stoicism was the mainstream educated philosophy — its influence pervasive in ethics, physics, and logic. Plotinus engages Stoic doctrines constantly without usually naming individual Stoics: their corporealism and materialism (IV.7), their theory of total mixture (II.7), their determinism and fate (III.1), and their reduction of the soul to a corporeal pneuma (breath-spirit). Yet he quietly absorbs Stoic ideas about cosmic sympathy, the logos as a structuring rational principle diffused through nature, and the language of providence.

Plotinus' view: The principal philosophical opponents — Plotinus treats Stoic materialism as the most dangerous error in philosophy, the mistake of confusing the instrument (body) with the craftsman (soul). He engages them more frequently than any other school, refuting their positions while borrowing their vocabulary.

The Gnostics

Gnosticism

Members of Plotinus' own Roman circle — likely adherents of Sethian or Valentinian Gnostic traditions — who attended his seminars and shared many of his metaphysical premises but drew radically different conclusions. They claimed special revelatory knowledge, multiplied the levels of divine emanation with exotic names, denigrated the visible cosmos as the botched product of an ignorant or malicious creator, and attacked the goodness of the world-soul. Porphyry tells us that Plotinus assigned him the task of refuting a Gnostic text called the Zostrianos.

Plotinus' view: A personal and urgent polemic — these were people sitting in his seminar, and II.9 ("Against the Gnostics") is the only treatise where Plotinus' tone turns genuinely angry. He sees their contempt for the cosmos as an insult to its maker and a betrayal of Plato, whose Timaeus celebrates the visible world as a beautiful living image of eternity.

Numenius & Middle Platonism

Middle Platonism

Numenius of Apamea (fl. c. 150 CE) was a 2nd-century Platonist who anticipated several of Plotinus' key doctrines — a triad of divine principles, the transcendence of the First God beyond being and intellect, and the soul's fall into matter. Alongside Numenius, the broader Middle Platonic tradition (Atticus, Albinus, Plutarch of Chaeronea) provided the interpretive framework within which Plotinus worked: the synthesis of Platonic metaphysics with Aristotelian logic and Pythagorean number theory. Porphyry records that Plotinus' enemies accused him of plagiarizing Numenius — a charge serious enough that Amelius wrote a treatise to refute it.

Plotinus' view: Acknowledged predecessors whose insights he quietly absorbs, transforms, and surpasses — Plotinus never names Numenius in the Enneads, but the structural parallels are unmistakable. Where Numenius' theology remains mythological and loosely organized, Plotinus provides the rigorous metaphysical architecture.

Ammonius Saccas

Alexandrian Platonism

An Alexandrian philosopher (fl. c. 175–242 CE) who taught Plotinus for eleven years (232–243). Ammonius left no writings — his teaching was entirely oral, in the tradition of Socrates — and our knowledge of his thought comes only through his students. Besides Plotinus, his pupils included Origen the pagan philosopher (not to be confused with the Christian Origen, though the ancient sources are muddled on this point) and Erennius, who broke an agreement among the three students to keep Ammonius' doctrines secret. Porphyry reports that before finding Ammonius, Plotinus had wandered restlessly among the teachers of Alexandria, dissatisfied with all of them, until a friend brought him to Ammonius' lectures — whereupon Plotinus declared: "This is the man I was looking for."

Plotinus' view: The decisive formative influence. Plotinus' entire philosophical vision — the three hypostases, the soul's ascent, the One beyond being — emerged from Ammonius' oral teaching, though it is impossible to disentangle what belongs to the master and what is Plotinus' own development. Plotinus never names Ammonius in the Enneads, yet the eleven years of study clearly shaped everything that followed.

Porphyry of Tyre

Neoplatonism

A Phoenician philosopher (c. 234–c. 305 CE) who joined Plotinus' school in Rome in 263 CE at the age of thirty and remained for six years. Already a trained scholar — he had studied under Longinus in Athens — Porphyry brought literary and philological skills that complemented Plotinus' speculative genius. During his time in the school, Plotinus composed many of his greatest treatises (the "middle period"), and Porphyry reports that the master once devoted three consecutive seminar days to answering his questions. When Porphyry fell into a suicidal depression, Plotinus diagnosed it as melancholy rather than philosophy and sent him to Sicily to recover. Around 301 CE, some thirty years after Plotinus' death, Porphyry edited the 54 treatises into the six Enneads — imposing the thematic and numerological order that every reader since has inherited. He also prefixed his biography, On the Life of Plotinus, our sole source for the chronology and circumstances of composition.

Plotinus' view: The most philosophically gifted student and the indispensable editor — Plotinus entrusted Porphyry with correcting and revising his treatises, a task no other student was given. Without Porphyry's editorial labor the Enneads would not exist in any readable form, and every subsequent reader of Plotinus sees the master through Porphyry's arrangement, prefaces, and interpretive choices.

Amelius Gentilianus

Neoplatonism

An Etruscan philosopher (fl. c. 246–270 CE) who joined Plotinus' school around 246 CE — nearly two decades before Porphyry arrived — and remained for twenty-four years, the longest tenure of any student. He kept meticulous notes of the seminars, compiled and systematized the teachings of Numenius in over a hundred volumes, and served as Plotinus' primary assistant and the school's institutional memory. After Plotinus' death he retired to Apamea in Syria, where he adopted a son. His own voluminous philosophical writings are entirely lost.

Plotinus' view: The most faithful and industrious student — Plotinus trusted Amelius with the day-to-day intellectual life of the school, including the defense against the Numenius plagiarism charge. Amelius' painstaking record-keeping preserved the oral teaching that Porphyry later drew on when editing the Enneads.

Eustochius

Neoplatonism

A physician from Puteoli (fl. c. 268–270 CE) who studied with Plotinus in his final years and was the only disciple present at his death in Campania in 270 CE. He received Plotinus' last words — "Strive to give back the Divine in yourselves to the Divine in the All" — as a snake crept under the bed and slipped through a hole in the wall. Eustochius produced his own independent edition of the treatises, organized differently from Porphyry's, but it was soon eclipsed and is now entirely lost.

Plotinus' view: A late but intimate companion — Eustochius arrived when the other senior students had departed and Plotinus' health was failing, and the deathbed scene Porphyry preserves through him is one of the most moving passages in ancient philosophical biography.