Rome Regulations Commentary 4th Ed: Why It Matters for Cross-Border Practice in 2026
Private international law practitioners have spent the past several years navigating two structural shifts in European cross-border litigation: the practical fallout of the UK's departure from the EU conflict-of-laws framework, and the rapid expansion of economic sanctions regimes tied to Russia, Iran and other jurisdictions. Both developments touch the Rome I and Rome II Regulations directly — Rome I through the choice-of-law rules that determine which contract law applies in a dispute, and Rome II through the "overriding mandatory provisions" mechanism that lets a court apply sanctions law even where the contract points elsewhere. Courts across the EU and Member State tribunals have issued a steady stream of rulings on both fronts since 2020, and firms advising on UK-EU transactions or sanctions-exposed contracts have had no single, current reference synthesising that case law — until now.
Kluwer Law International's Rome Regulations: Commentary, now in its Fourth Edition, closes that gap. Edited by Professor Gralf-Peter Calliess (University of Bremen) and Professor Moritz Renner, the volume provides article-by-article analysis of the Rome I, Rome II and Rome III Regulations, incorporating the CJEU and Member State jurisprudence issued since the Third Edition and adding dedicated treatment of the post-Brexit UK-EU relationship and the sanctions/overriding-mandatory-provisions intersection.
In practice, that structure supports several concrete tasks: a litigator can turn directly to the article governing a specific contractual dispute rather than searching narrative chapters; a compliance team can check how a sanctions regime interacts with a contract's governing-law clause under Rome I/II before advising a client; and a firm drafting cross-border commercial agreements can confirm the mandatory limits Rome I places on party autonomy when selecting a governing law.
For law libraries serving international, EU or commercial law faculties and firms, this is the kind of reference title that earns its shelf space through repeated, practical consultation rather than one-off reading — the article-by-article format is built for quick lookup during active matters, not cover-to-cover study.
CLNZ Books sources this and other specialist international law titles directly from leading academic and professional publishers, with worldwide shipping and secure payment by card, PayPal or bank transfer, and invoicing support for institutional and firm orders.
Q&A
Q: What is the main change in the Fourth Edition of Rome Regulations: Commentary?
A: It updates the article-by-article analysis of the Rome I, II and III Regulations with CJEU and Member State case law issued since 2020, and adds dedicated coverage of the post-Brexit UK-EU relationship and the interaction between economic sanctions and overriding mandatory provisions.
Q: Who edits this commentary?
A: Professor Gralf-Peter Calliess of the University of Bremen and Professor Moritz Renner, both scholars of European private international law.
Q: Does the book cover Rome III as well as Rome I and Rome II?
A: Yes. It includes a dedicated part on the Rome III Regulation governing the law applicable to divorce and legal separation in participating EU Member States.
Q: Is this commentary suitable for practitioners, or is it primarily academic?
A: It is written and structured for practitioner use, following an article-by-article "German-style" format designed for quick reference during live matters, while remaining a standard citation source in academic and judicial work.
Q: Where can I buy Rome Regulations: Commentary, 4th ed?
A: You can order Rome Regulations: Commentary, 4th ed directly from CLNZ Books, with worldwide shipping and secure payment by card, PayPal or bank transfer.