Entity

Gerard of Cremona

The twelfth-century Italian who learned Arabic in Toledo and produced the largest single body of translations carrying Greek and Arabic science into Latin.

Gerard came over the Alps for a single book. The great Greek astronomy of Ptolemy — the Almagest, the work that fixed the heavens into nested circles and gave the Latin schools their model of the cosmos — existed nowhere in Latin, and the short notice his pupils set down after his death reports that it was love of that text, which he knew was not to be had among his own people, that brought him to Toledo. There he found not one book but a city of them: shelves of Arabic on every science, the deposit of centuries of learning that the Islamic world had gathered, refined, and extended. He learned the language to read them. He never went home.

Toledo had fallen to Christian Castile in 1085, but conquest had not emptied its libraries. Arabic books remained, and so did the scholars — Mozarab Christians, Jews, the children of the city — who could read them aloud. The old capital of al-Andalus thus became the chief door through which the bookrooms of Islamic Spain opened onto the Latin West, and Gerard of Cremona (c. 1114–1187) worked at the center of that opening for the better part of forty years. He was not the first translator to settle there, nor the only one; but he was, by a wide margin, the most productive. No other single person in the entire Middle Ages rendered so much from Arabic into Latin.

The corpus

What survives of his program is, in the first place, a list. When Gerard died, the companions who had worked beside him — his socii — drew up a memorial that joined a brief life to a catalog of the books he had translated, and to a short eulogy. The catalog runs to some seventy-one titles; modern reckoning, weighing attributions the list omits, raises the working count toward eighty-seven. What matters is less the exact number than the reach. The shelf he built spans nearly the whole curriculum of the medieval sciences.

In astronomy, the Almagest itself — the manuscript colophon of the most famous copy is dated 11 August 1175, long taken as the date of the work — along with the astronomical handbooks that came with it. In geometry, Euclid’s Elements, the foundation text of Latin mathematics for four centuries. In natural philosophy, Aristotle on the physics of the sublunary world and on the heavens: the Physics, De caelo, De generatione et corruptione, the Meteorology, works that supplied the framework the schoolmen would spend two centuries arguing inside. In mathematics, the algebra of al-Khwārizmī. In medicine, the Canon of Avicenna — which became the standard textbook of the European medical faculties and held that place into the seventeenth century — and a wide body of al-Rāzī, the physician the Latins called Rhazes. And then the texts that shade, at their edges, toward what later readers filed under the occult sciences: long treatises of astrology, the natural philosophy of stones and stars and their powers, and the alchemical writings carried under the name of Jābir ibn Ḥayyān.

Among the philosophical works was the Liber de Causis — a compilation made in the ninth-century circle of al-Kindī, built from propositions lifted out of Proclus’s Elements of Theology and stitched through with Plotinian matter. Gerard rendered it into Latin at Toledo in the last two decades of his life, and it circulated as a work of Aristotle until Thomas Aquinas, having at last read a direct Latin Proclus, identified its true source about 1272. That single text is a clean specimen of what passed through his hands: Greek thought, reworked in Baghdad, carried west in Arabic dress, and absorbed into the Latin canon under a borrowed name. He also translated the De scientiis of al-Fārābī, the classification of the sciences that gave Latin readers a map of the Arabic philosophical curriculum. He did not translate to win an argument or to advance a thesis. He translated to make the texts exist in Latin at all — and the choosing was deliberate, weighted toward the mathematical and natural sciences that his contemporary Dominicus Gundissalinus, working the same city, largely left to him.

The method of the workshop

The volume is impossible to credit to one man bent alone over a desk, and it was not. Gerard worked through intermediaries. A native reader of Arabic — Daniel of Morley, an Englishman who studied at Toledo, names a Mozarab called Ghālib (Galippus) as the man who helped with the Almagest — would carry a passage first into spoken Castilian, the Romance vernacular of the street; Gerard, listening, set it down in Latin. The procedure was oral, collaborative, and two-staged, Arabic to Romance speech to Latin script. Charles Burnett has shown that this protocol was the standard mode of the Toledan workshop, not a peculiarity of Gerard’s; the canon Gundissalinus worked the same way with the Jewish philosopher Avendauth. The method accounts for two features of the results at once — their sheer quantity, since a fluent reader at his side could feed text faster than any single scholar could parse it, and their famous literalness, since the Latin tracks the Arabic word by word, clause by clause, in a way that preserved the technical sense even where it strained Latin idiom.

That literalness left a permanent residue in European speech. Where no Latin word existed for an Arabic technical term, Gerard and his peers kept the Arabic, and it stayed. The vocabulary of the heavens carries it still: zenith from the Arabic for the point above the head, nadir for its opposite, azimuth for the measured directions of the horizon — words that entered Latin through the astronomical instruments and tables the Toledan translators rendered. The algebra of al-Khwārizmī carried his own name forward as algorism and lent its title-word, al-jabr, to the discipline. A whole stratum of European scientific language is sediment left by this transfer, and a fair share of it settled in Gerard’s lifetime, in his workshop, in his choices.

The conduit and the occult sciences

His place in esoteric history is real but indirect, and the distinction is exact. Gerard was a working scholar, not a magus; nothing in the record marks him as a practitioner of any of the arts his texts described. He cast no horoscopes that the sources preserve, compounded no elixirs, engraved no talismans. He read Arabic and wrote Latin, and that was the whole of his craft.

Yet the material that flowed through Toledo became the ground on which medieval and Renaissance magic were built. The astrological doctrine that reached the universities, the Aristotelian cosmos of concentric spheres turning the sublunary world below, the treatises on the hidden powers of stones and stars — all of it entered Latin learning as science, the most advanced science then available, and only later did parts of it harden into the bounded category of the occult. The same Toledan corridor through which Gerard sent Ptolemy and Euclid also carried the Arabic astrological Hermes — the technical Hermes of islamicate astral causality and correspondence, distinct from the Greek philosophical Hermes Trismegistus that Ficino would recover three centuries on. Whether any particular Hermetic item in the surviving lists is securely Gerard’s own work remains disputed among scholars; the Arabic Hermetica, the dense astrological and natural-philosophical body that came west through his school, is not in doubt. The thirteenth-century catalogs of astral magic — the Speculum astronomiae among them — drew their inventory of licit and condemned books from exactly this transmitted corpus. Michael Scot, a generation younger and remembered within living memory as a wizard, translated in the same tradition and at the same task; the difference between the working philologist and the legendary magus is a difference the later record kept making, and not always where it belonged.

The figures who would later practice these arts — the astrologers of the courts, the natural magicians of the Renaissance — inherited a vocabulary and a library that translators like him had fixed in place. They did not always know his name. That is the ordinary condition of a channel.

Texts and scholarship

The primary witness for Gerard’s life and program is the Vita, Commemoratio librorum, and Eulogium his companions composed at his death, re-edited with the fullest modern analysis by Charles Burnett in “The Coherence of the Arabic-Latin Translation Program in Toledo in the Twelfth Century” (Science in Context 14, 2001, 249–88), the study that established the deliberate, programmatic shape of his choices and distinguished his field from Gundissalinus’s. The standard placement of the Toledan effort within the broader movement of learning westward is David C. Lindberg’s chapter, “The Transmission of Greek and Arabic Learning to the West,” in Science in the Middle Ages (University of Chicago Press, 1978, 52–90). Burnett’s collected papers on the subject are gathered in Arabic into Latin in the Middle Ages (Ashgate Variorum, 2009); his full bibliography is held at the Warburg Institute. The older narrative survey remains Lynn Thorndike’s A History of Magic and Experimental Science (Macmillan, 1923), whose second volume treats the twelfth-century Toledo school and the thirteenth-century image-magic corpus that descended from it. The intellectual texture of the period as a whole is set out in Charles Homer Haskins’s The Renaissance of the Twelfth Century (Harvard, 1927) and his earlier Studies in the History of Mediaeval Science (Harvard, 1924), the works that first named the twelfth century a renaissance and put the translators at its heart.

The texts themselves can be read where they have been hosted. The Greek philosophical Hermes that the Latin West later set beside its Arabic inheritance survives in English as The Divine Pymander and across the Corpus Hermeticum, whose opening treatise, Poimandres, is hosted in full; the Neoplatonic stream that fed the Liber de Causis through Proclus and Plotinus is held in the Enneads.

What Gerard left was less a doctrine than an inheritance: a body of Greek and Arabic learning that the West could now read without leaving home. The conduits of such a transfer are easy to forget once the water is flowing. Gerard was one of the largest of them.

→ In the library: The Divine Pymander of Hermes Mercurius Trismegistus · I. Pœmandres, the Shepherd of Men · Plotinus: The Enneads

Sources

Burnett 2001
Lindberg 1978
Haskins 1927
Daniel of Morley, Philosophia