Vittoria Perrone Compagni's critical edition of De occulta philosophia libri tres (Brill, 1992) is the scholarly foundation on which all serious modern work on Agrippa's occult philosophy rests. Before its publication, the DOP was available in a series of early modern printings of varying reliability and in the 1651 English translation by James Freake — but no scholar had attempted to establish the text systematically against the surviving manuscript tradition or to map precisely the differences between the two major versions of the work, the Würzburg manuscript of ca. 1510 (W) and the first printed Cologne edition of 1533 (K). Perrone Compagni's edition, published as volume 48 in Brill's Studies in the History of Christian Traditions, achieved both of these goals and in doing so transformed the scholarly study of Agrippa.

The Editorial Challenge

The challenge facing an editor of the DOP is unusually complex. Most critical editions involve a single text with multiple manuscript and print witnesses whose variants must be adjudicated to establish the best reading. The DOP presents a fundamentally different situation: there are two substantially different versions of the work, composed at different times in Agrippa's life, that differ not merely in individual readings but in their overall structure, chapter organization, and content. The Würzburg manuscript, probably completed around 1510 and sent to the abbot Trithemius for evaluation, is a full three-book compendium that covers the same broad subject matter as the printed edition but in a significantly different form: chapters are arranged differently, many passages present in 1533 are absent, and some passages present in 1510 are absent from 1533. Agrippa then spent more than twenty years revising, expanding, and restructuring the work before its publication.

The editor must therefore make decisions not merely about individual readings but about how to present two substantially different versions of the same work within a single scholarly apparatus. Perrone Compagni's solution — to print the 1533 text as the main text and record the 1510 variants in the critical apparatus, supplemented by the Table of Comparison that maps the structural relationship between the two versions — is the standard solution for critical editions of works with major revisions, but its execution here required systematic collation of all witnesses across nearly 700 pages of dense Latin text.

The Manuscript Tradition

The Würzburg manuscript (W) is MS M.ch.q.50, now held in the Universitätsbibliothek Würzburg. Perrone Compagni's description of the manuscript in the introduction to the edition provides the most detailed account available in print: the physical description, the handwriting, the relationship between the main text and various marginal additions, and the evidence for the manuscript's transmission history. The identification of the manuscript as the draft sent to Trithemius in 1510 — which was already established before Perrone Compagni but not rigorously argued — is confirmed and documented in the apparatus.

The printed tradition begins with the 1531 Antwerp edition (printed by Grapheus for Soter), which differs from the 1533 Cologne edition (printed by Soter himself) in ways that reflect the final stages of Agrippa's revision. The relationship between these two printings — which, confusingly, were produced by overlapping networks of printers and booksellers — is carefully documented in the introduction. The apparatus records variants from both printings, from the 1531 Paris edition (which has a different set of variants), and from a small number of other witnesses. The result is a picture of the printed tradition that is substantially more detailed than anything previously available.

The Table of Comparison

The most strategically important feature of the edition for the study of Agrippa's revision process is the Table of Comparison (pp. 64–69 in the edition). This table, which Agrippa himself compiled or directed, maps every chapter of the 1533 edition to its counterpart(s) in the Würzburg manuscript. It uses a compact but consistent notation: "W, 1: 2" means "corresponds to chapter 2 of Book I of W"; "W, 1: 2 + two short additions" means "W's text is the base but the 1533 version adds material"; "W, 1: 2 and W, 1: 3" means "this 1533 chapter combines two W chapters"; "new" or no W reference means "has no counterpart in W." The table covers all 203 chapters of the three books plus the four prefatory epistles, providing a complete structural map of the revision.

This table is the primary data source for the chapter classification system used throughout this comparison site. The classifications — "New in 1533," "Heavily Expanded," "Revised and Expanded," "Preserved from W," "Largely New" — are derived from the collation note categories that Perrone Compagni's table records. The table's value extends beyond simple comparison: it preserves evidence of Agrippa's own understanding of what he had done in the revision, since the table was part of the Brill edition apparatus rather than a purely modern editorial construction. When the table says a chapter is "new," that reflects a judgment either by Agrippa himself or by an authoritative early witness close to the revision process.

The table's OCR transmission history is documented in this site's pipeline documentation: the Perrone Compagni edition was digitized with ABBYY FineReader, and the table's column structure required a custom parser to reconstruct accurately. The row-by-row mode of the first page (chapters 1–15), the column-by-column mode of subsequent pages (where ABBYY read all left-column references before all right-column descriptions), and the split-token artefacts on page 64 all required specific handling before the 203-entry dataset could be reliably extracted.

The Introduction: Composition History and Sources

Perrone Compagni's introduction to the edition is a substantial scholarly essay that stands on its own as a contribution to the history of the DOP's composition and intellectual context. The sections on Agrippa's sources — Ficino's De vita coelitus comparanda, Pico's Conclusiones, Reuchlin's De verbo mirifico and De arte cabalistica, the pseudo-Dionysian corpus, the Platonic commentators (Iamblichus, Proclus, Porphyry), the Arabic natural magic tradition represented by the Picatrix, and the medieval natural philosophy of Albertus Magnus — are the most precise and rigorously documented available. Perrone Compagni has read the sources in their original editions and can identify specific passages and editions that Agrippa used, rather than simply naming traditions in general terms.

The account of the composition history is equally valuable. Perrone Compagni argues, on the basis of the textual evidence, that the revision between 1510 and 1533 was not a linear process of expansion but a complex restructuring that added new books of sources (particularly in the Kabbalistic sections of Book III, which draws on Reuchlin's work published after 1510), reorganized existing material, and in some cases substantially changed the theological framing of chapters whose content was largely preserved. This argument has been the starting point for all subsequent work on the revision history, including the analysis behind the classification system used in this site.

The Critical Apparatus

The apparatus itself — the dense system of sigla, variant readings, and cross-references that runs at the bottom of each page of the text — is the most technically demanding part of the edition for non-specialists. Perrone Compagni uses a standard classical philological apparatus with sigla for each witness and abbreviated notation for variant types (addition, omission, substitution, transposition). Learning the conventions requires an initial investment, but the rewards are substantial: the apparatus makes it possible to track, verse by verse and chapter by chapter, exactly how the text changed between 1510 and 1533, and to identify the specific witnesses for each reading.

The apparatus is unusual among critical editions in the history of ideas in that it gives full weight to structural variants — entire passages or chapters present in one version and absent in another — rather than focusing only on word-level variants. This is the right approach for a work whose revision history is primarily structural rather than lexical, and it reflects Perrone Compagni's sophisticated understanding of what kind of text the DOP is and what kind of apparatus its revision history requires.

Reception and Significance

The edition's reception has been enthusiastic among specialists and critical in specific dimensions. Dinzelbacher's review in Mediaevistik (1994) noted that the apparatus, while excellent on classical and Renaissance sources, was somewhat thinner on the specifically medieval layers of Agrippa's borrowing — Albert the Great, Roger Bacon, the Speculum astronomiae, and the broader scholastic tradition of natural philosophy that underlies parts of Book I. Pereira's review in Nuncius (1994) was more uniformly positive, praising the introduction's account of the natural-philosophical tradition and the apparatus's handling of the complex manuscript and print relations.

Lehrich (2003) uses the edition extensively and credits it as foundational — without Perrone Compagni's text, the precise philosophical analysis of specific chapters that Lehrich undertakes would have been impossible. Van der Poel (1997) similarly depends on the edition for his analysis of the textual history of the declamatory works. The critical edition is, in the most literal sense, the condition of possibility for serious modern scholarship on the DOP: it established what the text says, which versions say it, and in what relationship they stand to each other. Everything since has been built on that foundation.

The edition's practical limitation is simply its accessibility: the Brill volume is expensive, requiring institutional library access, and the Latin critical text with its dense apparatus is not usable by readers without fluent Latin and familiarity with classical philological conventions. Tyson's 1993 Llewellyn edition, published the same year, provides the English complement. Together, the two editions give English-speaking readers both the scholarly foundation (Perrone Compagni) and the practical guide (Tyson) they need to work seriously with the DOP.