The Perpendiculum: Presumptions and Legal Arguments in the 12th Century

David De Concilio, Ph.D. (2022, University of St Andrews/Università degli Studi Roma Tre), is research fellow at the Università degli Studi di Padova. He has published articles on medieval Roman and canon law, with a specific interest in the interaction between law, theology, and liberal arts.

Acknowledgements

Preface

Abbreviations



Introduction

 1 Eighty Years of Research: A Historiographical Account

 2 The Perpendiculum as a Source for the History of Presumptions

 3 The Reasons for a New Investigation

 4 Sources

 5 Map of the Book



Part1 The Analysis of the Work



1 The Work: The Perpendiculum and Its Text

 1 A European Text: The Manuscript Tradition of the Perpendiculum

 2 A Mosaic of Works: The Other Texts Inserted in the Perpendiculum

 3 Texts Appended to the Third Part of the Perpendiculum



2 The Perpendiculum in Its Context

 1 The Importance of the Summula for the Development of Brocards

 2 The Importance of the Summula for the Glossators’ Theory on Presumptions

 3 Contemporary Works with Textual Links to the Perpendiculum

 4 Works Directly Influenced by the Perpendiculum

 5 Later Fortunes of the Summula’s Distinction on the praesumptio legis



3 The Dating and the Author of the Perpendiculum

 1 The Dating of the Work

 2 The Problem of the Authorship



4 Conclusions: The Perpendiculum between France and Italy

 1 Southern Ideas in Northern France

 2 Paris and Bologna: So Far and Yet So Close

 3 From Paris to Italy

 4 Rethinking Historiographical Boundaries: The Perpendiculum as a Case Study



Part2 The Texts



1 Prolegomena to the Texts

 1 List of the Manuscripts

 2 Editorial Decisions

 3 Presentation of Text



2 Manuscript Descriptions



3 The Text of the Perpendiculum



PartI (Summula de presumptionibus)

 ‹I.› Incipit de presumptionibus

 ‹II. Circa extrinseci facti essentiam›

 ‹III. Circa extrinseci facti qualitatem›

 ‹IV. Circa intrinseci facti substantiam›

 ‹V. Circa intrinseci facti qualitatem›

 ‹VI. Circa iuris vel scripture interpretationem›

 ‹VII. De fide autem instrumentorum et attestationum›

 ‹VIII. De re quam prelatus possedit›

 ‹IX.› Quando presumptio non admittit probationem in contrarium

 ‹X. Explicit›



PartII



PartIII

 1 Critical Table of Contents

 2 Synoptic Table of the Brocards in PartIII

 3 List of Other Brocards that Occur Only in a Single Manuscript



4 Appendix: Other Texts Inserted into the Perpendiculum

 1 Texts Inserted into Several Manuscripts

 2 Texts inserted into G and P1



Bibliography

Index to Part1 (Chapters 1–4)

Index to the Perpendiculum (PartsI–III) and the Appendix

Index to Legal Sources

Index to Incipits of the Brocards (PartsII and III)

Index to Manuscripts