Bessarion

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Bessarion (c. 1403–1472) was a Byzantine-born scholar and churchman who became a cardinal of the Roman Church and one of the principal conduits by which Greek philosophy and Greek manuscripts reached Renaissance Italy. Born in Trebizond on the Black Sea, schooled at Constantinople, he entered the Orthodox monastic clergy and rose to be metropolitan of Nicaea.

He took the monastic name Bessarion young, after an early desert saint, and kept it for life; his given name had been Basil. The empire he was born into was a remnant — the Byzantine Empire had shrunk to Constantinople and a scatter of provinces, with the Ottoman armies tightening around them — and a Byzantine education in that twilight was a deliberate act of salvage. He learned his Greek letters in the capital, then went south to the Peloponnese, to the court-school at Mistra below Mount Taygetos, where he studied under George Gemistos, called Plethon, the last great Platonist of the Greek world. From Plethon he absorbed two things that would shape the rest of his life: a reverence for Plato read as the summit of philosophy, and the conviction that the Greek inheritance was a treasure worth carrying across whatever frontier would keep it. Plethon’s Platonism ran, in the end, toward a reformed pagan cult; Bessarion’s ran toward the Church. The divergence matters, but the schooling was shared.

From Nicaea to the Latin obedience

He rose quickly in the Orthodox hierarchy, and by 1437 he was metropolitan of Nicaea — an ancient and resonant see, the city of the first ecumenical council. That standing made him one of the senior Greek churchmen sent west on the most consequential ecclesiastical errand of the century: the attempt to end the schism between the Greek and Latin churches that had hardened over four centuries. The emperor John VIII Palaiologos came in person, and with him the patriarch, a long train of bishops, and the aged Plethon. The Greeks came because Constantinople was dying and union with the Latin West was the price of military help.

At the Council of Ferrara–Florence (1438–1439), Bessarion was one of the two chief Greek spokesmen, arguing the Greek case on the great dividing questions — the procession of the Holy Spirit, the filioque clause, purgatory, the bread of the Eucharist, the primacy of the Roman see. He began among the resisters and moved, over months of debate, toward accommodation, persuaded that the differences were more verbal than real and that the Greek and Latin fathers could be reconciled. On 6 July 1439 the decree of union, Laetentur Caeli — let the heavens rejoice — was proclaimed in Florence, and Bessarion read it aloud in Greek beneath the new dome of the city’s cathedral. It was a triumph that dissolved almost on contact. Carried home, the union was repudiated by most of the Orthodox clergy and faithful, who would sooner accept the sultan’s turban than the cardinal’s hat; within fourteen years Constantinople was gone, and the union with it.

Bessarion stayed. Pope Eugene IV made him a cardinal in December 1439, and he never returned to the East to live. The choice was not merely careerist. He had come to believe the union was true and the Latin Church its proper home, and he spent the rest of his life inside the institution he had crossed over to — a Greek in a Roman college, holding the titular dignity of Latin Patriarch of Constantinople over a city he would never govern. He served as papal legate, as governor of Bologna, and from 1463 as senior cardinal, primus cardinalium, presiding over the conclaves that followed. Twice he came near the papacy itself. In the conclave of 1455 he was an early favorite, valued for standing above the feud between the Roman baronial houses; the objection that prevailed against him was that he was a Greek and a foreigner, his beard and his birth held against a throne the cardinals kept Italian. The same objection was raised again in 1471. He died, the next year, on 18 November 1472 at Ravenna, returning from a fruitless embassy to France to rouse a crusade against the Turks that never came.

In Calumniatorem Platonis

His lasting weight lies in scholarship rather than office. Bessarion stood at the center of the fifteenth-century quarrel over the relative rank of Plato and Aristotle, a dispute carried from the Greek world into Latin learning. The quarrel had Byzantine roots — Plethon had lit it at Florence with a small, incendiary treatise on the differences between the two philosophers, arguing Plato’s superiority before an Italian audience that had known Plato mostly by name. It turned bitter when George of Trebizond, a Cretan-born émigré and a fierce Aristotelian, answered with the Comparatio Philosophorum Platonis et Aristotelis (1458), which did not merely rank Aristotle above Plato but attacked Plato himself as immoral, irreligious, and politically poisonous — a corrupter whose doctrines, George charged, were paving the road for a new pagan religion that would overthrow Christianity. The accusation was aimed past Plato at Plethon, and past Plethon at Bessarion.

Against this Bessarion wrote In Calumniatorem Platonis, against the calumniator of Plato. He composed it first in Greek, then translated and greatly expanded it into Latin himself, withdrawing a finished draft to deepen it; the work appeared in its full Latin form in Rome in 1469, in four books, one of the very first philosophical books to issue from the new printing presses of the city. It is a measured defense, not a counter-attack: Bessarion declines to demolish Aristotle in order to raise Plato, insisting instead that both philosophers, read rightly, point in the same direction and that George had simply misread Plato — mistaking the dramatic speech of fictional characters for Plato’s own doctrine, and Latin mistranslations for Greek meaning. The deepest book argues that Plato, far from being the enemy of Christian truth, stands closer to it than his detractors allow: that his teaching on the soul’s immortality, on a divine first principle beyond being, on the world as the work of a good maker, is the nearest a pagan came to revelation. To make the case airtight Bessarion ransacked the medieval schoolmen for support, building a third book that met the Latin Aristotelians on their own ground.

He did not present Plato as a rival to the Church but as a witness compatible with it, and in doing so he helped make Platonism respectable to Latin readers at the moment Marsilio Ficino was preparing, under Cosimo de’ Medici, to translate the dialogues whole. The defense did more than win an argument. It established the terms on which a Christian could read Plato without apology — and it furnished, in its patient reconciling of Greek philosophy with the faith, a model that the Florentine Platonists would carry far past anything Bessarion intended.

The ancient wisdom and the Florentine current

That defense connects Bessarion to the wider current later esotericism would draw on. The Florentine recovery of Plato, of Plotinus, and of the writings ascribed to Hermes Trismegistus belongs to the same generation and the same conviction — that an ancient wisdom, pagan in its sources, could be reconciled with Christian theology. This is the structure that Ficino would name the prisca theologia, the ancient theology — a single chain of revelation running from a primordial sage through Zoroaster, Hermes, Orpheus, Pythagoras, and down to Plato, each link transmitting the same buried truth. The metaphysics that organized it was Neoplatonism — the doctrine, descended from Plotinus through Proclus, of all things flowing out from and returning to a single source, the One beyond being and name. Bessarion’s Plato is already this Plato, read through the late-antique commentators; his own library held Proclus and the Chaldean Oracles that Plethon had re-edited, and his defense leans on Proclus and the Neoplatonic tradition without embarrassment.

What Ficino received from this milieu was a Plato already made safe for Christian hands. When Ficino set the dialogues aside in 1463 to translate the Hermetic Pimander first, on the conviction that Hermes was older than Plato and the fountainhead of the whole tradition, he was extending a logic Bessarion had helped legitimize — that the deepest pagan wisdom and the Christian revelation were two readings of one light. The later Platonists pressed the synthesis further than the cardinal would have gone: Pico della Mirandola folded Kabbalah and Arabic philosophy into the chain; Agostino Steuco gave it the name philosophia perennis. Bessarion belongs at the head of that descent not as its author but as the figure who made its first move credible. His near-contemporary Nicholas of Cusa, whom he met on the same Byzantine embassy that produced the Council, carried a parallel current — Greek manuscripts, Platonic infinity, the coincidence of opposites — back across the Alps into German lands; the two of them are the twin gates through which Byzantine Platonism entered the Latin Middle Ages as it gave way to the Renaissance.

The cardinal’s house and the cardinal’s books

Bessarion’s palace in Rome became something the city had not seen: a working academy of Greek learning, a household of émigré scholars maintained at the cardinal’s expense. Around him gathered the men who would teach the West its Greek — Theodore Gaza, Niccolò Perotti, and others, with the astronomer Regiomontanus among those he patronized — and he set them to copying manuscripts and turning Greek texts into Latin so that a literature locked in a dying language could pass into a living one. After Constantinople fell on 29 May 1453 the work became urgent and the household swelled with refugees. He bought books constantly, through agents combing the monasteries and bazaars of a vanishing world, and over a lifetime assembled one of the largest private collections of Greek manuscripts that had ever existed — not for display but as an ark.

He was explicit about the purpose. In 1468 he gave the collection to the Republic of Venice, announcing the gift to the Doge Cristoforo Moro and the Senate on 31 May, on the reasoning that a city of many Greeks and many ships — alterum Byzantium, another Byzantium, in the phrase attached to the gift — would keep the books safest from the dispersal that was swallowing the libraries of the East, since this was the place where the Greek diaspora had gathered. The donation comprised some 482 Greek and 264 Latin codices, the densest single deposit of Greek learning to survive the century. It became the foundation of the Biblioteca Marciana, and through it a substantial portion of surviving Greek literature — philosophers, fathers, historians, poets, the working texts of antiquity — passed intact into the age of print, where copying could no longer be undone by the loss of a single city.

The texts and the scholarship

The two great Latin documents of the Plato–Aristotle controversy survive and have been edited in modern times. The reception of In Calumniatorem Platonis and its quarrel is reconstructed in John Monfasani’s “A tale of two books”, Renaissance Studies 21 (2008), which traces how Bessarion’s defense and George of Trebizond’s attack shaped each other across a decade of revision; Monfasani’s George of Trebizond: A Biography and a Study of His Rhetoric and Logic (Brill, 1976) remains the standard study of Bessarion’s adversary. Bessarion’s own Latin of the defense — the Liber Defensionum contra Obiectiones in Platonem, his self-translation withdrawn and reworked before the 1469 edition — has now been edited by Monfasani (De Gruyter, 2023) and assessed in the Bryn Mawr Classical Review, recovering the cardinal’s hand as a Latin stylist as well as a Greek thinker. The intellectual portrait of the man — theologian of union, defender of Plato, patron, collector — is drawn in the Stanford Encyclopedia of Philosophy’s entry on Bessarion. The history of the library and its passage to Venice is the subject of Lotte Labowsky’s Bessarion’s Library and the Biblioteca Marciana (Edizioni di Storia e Letteratura, 1979), the definitive reconstruction of what he gathered and what survived. The dialogues he fought for are hosted in the Jowett translation; the Neoplatonic metaphysics that organized his reading of them runs through the Enneads of Plotinus.

The union he worked for did not hold; the texts he gathered did.

→ In the library: The Dialogues of Plato (Jowett) · Plotinus, The Enneads (MacKenna)

→ Related: Neoplatonism · The One · Middle Ages · Hermes Trismegistus · Plato · Aristotle · Platonism · Marsilio Ficino · Prisca Theologia · Corpus Hermeticum · Byzantine Empire · Byzantine Platonism · Nicholas Of Cusa · Renaissance Neoplatonism · Giovanni Pico Della Mirandola · Cosimo De Medici · Proclus · Chaldean Oracles Tradition