Exploring the Nature of Law: Thomistic Juridical Realism and the Elements of Law's Ontology

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Petar Popović Kevin C. Walsh

Exploring the Nature of Law

Thomistic Juridical Realism and the Elements of Law's Ontology

Petar Popović, Kevin C. Walsh

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Hardback

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English

The Catholic University of America Press
17 October 2025

Roman Catholicism, Roman Catholic Church; Jurisprudence & philosophy of law

This is a book about the nature of the reality or the phenomenon referred to as ""law"" by lawyers and legal officials, but also by members of communities living under law, to the extent that they conceptualize the realm of ""law"" as something sufficiently distinguishable from other different or broader realities and phenomena.

The book belongs to the legal-philosophical field dedicated to the study of the very nature of law, that is, to the most basic or abstract part of the philosophy of law, which is sometimes referred to as ""the philosophy of philosophy of law"" or ""general jurisprudence.""

The scope of the book is to explore the essential features of law’s nature, namely, all those realities that pertain to law’s essence, the properties that make law into what it is. Despite the fact of plurality of legal-philosophical conceptions of law circulating in legal theory today, the book is optimistic about the very prospect of exploring the nature of law. It maintains that law has an essence and that it is possible to explore and describe this unique essence in an intelligible and reasonably detailed fashion, by identifying the basic elements of law’s ontology.

The book advances the claim that Aquinas’s account of legal ontology denotes the most accurate understanding of the phenomenon that we call ""law""—which the Angelic Doctor referred to as ius, constituted as such on the basis of the various manifestations of lex. Aquinas’s approach to understanding law’s nature that can be labeled ""Thomistic juridical realism"" and it may be categorized as a version of a natural-law theory of law. The book argues that a contemporary reading of Aquinas may indeed fruitfully contribute to an improved understanding of our present-day legal-philosophical analyses and discussions on the nature of law.

By: Petar Popović
Foreword by: Kevin C. Walsh
Imprint: The Catholic University of America Press
Country of Publication: United States
Dimensions: Height: 216mm, Width: 140mm,
ISBN: 9780813240237
ISBN 10: 0813240239
Pages: 238
Publication Date: 17 October 2025
Audience: Professional and scholarly , College/higher education , Undergraduate , Further / Higher Education
Format: Hardback
Publisher's Status: Active

Petar Popović is associate professor of canon law at the Pontifical University of the Holy Cross, Rome, co-editor of The Concept of Ius and the Nature of Law in Thomas Aquinas and the author of Natural Law and Thomistic Juridical Realism: Prospects for a Dialogue with Contemporary Legal Theory. Kevin C. Walsh is Knights of Columbus Professor of Law and the Catholic Tradition at Columbus Law School, The Catholic University of America.