The Questiones libri Porphirii is a commentary on Porphyry's Isagoge by the fourteenth-century logician Thomas Manlevelt. It is edited here in full. Not much is known of Thomas Manlevelt, but his work is remarkable enough. Following in the footsteps of William of Ockham, Manlevelt stresses the individual nature of all things existing in the outside world. He radically challenges our conceptional framework. He applies Ockham's razor in a ruthless manner to do away with all entities not deemed necessary for preservation. In the end, Manlevelt even maintains that substance does not exist. In this text early Ockhamism is being pushed to its extremes.

This volume, the first dedicated and comprehensive companion to medieval logic, covers both the Latin and the Arabic traditions, and shows that they were in fact sister traditions, which both arose against the background of a Hellenistic heritage and which influenced one another over the centuries. A series of chapters by both established and younger scholars covers the whole period including early and late developments, and offers new insights into this extremely rich period in the history of logic. The volume is divided into two parts, 'Periods and Traditions' and 'Themes', allowing readers to engage with the subject from both historical and more systematic perspectives. It will be a must-read for students and scholars of medieval philosophy, the history of logic, and the history of ideas.

Three basic forces dominated sixteenth-century religious life. Two polarized groups, Protestant and Catholic reformers, were shaped by theological debates, over the nature of the church, salvation, prayer, and other issues. These debates articulated critical, group-defining oppositions. Bystanders to the Catholic-Protestant competition were a third force. Their reactions to reformers were violent, opportunistic, hesitant, ambiguous, or serendipitous, much the way social historians have described common people in the Reformation for the last fifty years. But in an ecology of three forces, hesitations and compromises were natural, not just among ordinary people, but also, if more subtly, among reformers and theologians. In this volume, Christopher Ocker offers a constructive and nuanced alternative to the received understanding of the Reformation. Combining the methods of intellectual, cultural, and social history, his book demonstrates how the Reformation became a hybrid movement produced by a binary of Catholic and Protestant self-definitions, by bystanders to religious debate, and by the hesitations and compromises made by all three groups during the religious controversy.

This book sets out a thematic presentation of human action, especially as it relates to morality, in the three most significant figures in Medieval Scholastic thought: Thomas Aquinas, John Duns Scotus, and William of Ockham

This volume honours Sten Ebbesen with a series of essays on logical and linguistic analysis in the Middle Ages. Included are studies focusing on textual criticism, new finds of logical texts, and philosophical analysis and interpretation.

A study of Aquinas's theory of self-knowledge, situated within the mid-thirteenth-century debate and his own maturing thought on human nature.

This edition of Giraldus Odonis' Logica for the first time gives access to an important and original treatise, which has unduly been neglected since the author's death. It is also important in that it gives evidence of interesting achievements in the field of logic outside the anti-metaphysical circle surrounding Ockham.

Transcendental unity is a figure of thought of the Latin Middle Ages, which is indebted to Avicenna’s renewal of metaphysics and which is wrongly attributed to Aristotle. A specific interpretation of the demonstrable attribute determines the metaphysical reflection on ‘the one’ and turns it into a transcendental attribute of being. Notwithstanding the variety of epistemic constellations, however, this metaphysical relationship of being and unity always turns out to be a fundamental state of affairs. Transcendental unity identifies as a problem constellation, the principles of which are still effective in the critique of scholastic metaphysics in classical German philosophy.

The rediscovery of Aristotle in the late twelfth century led to a fresh development of logical theory, culminating in Buridan’s crucial comprehensive treatment in the Treatise on Consequences. Buridan’s novel treatment of the categorical syllogism laid the basis for the study of logic in succeeding centuries. This new translation offers a clear and accurate rendering of Buridan’s text. It is prefaced by a substantial Introduction that outlines the work’s context and explains its argument in detail. Also included is a translation of the Introduction (in French) to the 1976 edition of the Latin text by Hubert Hubien.

Early in the 1240s the University of Paris hired a recent graduate from Oxford, Roger Bacon by name, to teach the arts and introduce Aristotle to its curriculum. Along with eight sets of questions on Aristotle's natural works and the Metaphysics he claims to have authored another eight books before he returned to Oxford around 1247. Within the prodigious output of this period we find a treatise on logic titled Summulae dialectices, and it is this that is here annotated and presented in translation. The book is unique in several respects. First, there is the breadth of its sources. Not only do we find explicit reference to the usual authors such as Aristotle, Plato, Boethius, Porphyry, Cicero, and Priscian, we also find unexpected reference to Augustine, Bernardus Silvestris, Donatus, Terence, and Themistius, along with mention of the Muslim philosophers Algazel and Ibn Rushd. Second, it is clear that Bacon is drawing on or reacting to an extraordinarily wide variety of medieval sources: Garland the Computist, Hugh of St. Victor, Master Hugo, Hugutius of Pisa, Isidore of Seville, Nicholas of Damas, Nicholas of Paris, Richard of Cornwall, Robert Kilwardby, Robert of Lincoln, and Robert the Englishman. Third, it unexpectedly presents a full-blown treatment of Aristotle's theory of demonstration. And finally, Bacon reveals a highly unorthodox view of the signification of common terms. Bacon, here, takes his students and us deeper into medieval sources and controversy than any of his rivals do.