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Oxford Historical Treaties (OHT) is the premier resource for historical treaty research and home to the full text of The Consolidated Treaty Series, the only comprehensive collection of treaties of all nations concluded from 1648 through 1919. Available via the Oxford Public International Law platform, OHT is cross-searchable with Oxford’s leading public international law resources and benefits from a modern, intuitive interface and sophisticated functionality.

Site features include:

  • Access, for the first time, the complete The Consolidated Treaty Series, in an accessible, intuitive format
  • Available via the Oxford Public International Law platform, allowing users to cross-search all of Oxford’s public international law resources
  • General editor Randall Lesaffer – Professor of Legal History at Tilburg Law School – ensures accuracy and authority while overseeing the expansion of the site to include additional commentary and contextual information
  • Extend research capabilities using the Oxford Law Citator – a ground-breaking research navigation tool providing direct links between Oxford content and carefully selected third party websites

More Resources:

Clive Parry's original introduction to the series
Table of Abbreviations
Table of References for Dutch Colonial Treaties
Colonial Treaties 1648-1920
Postal and Telegraph Agreements 1666-1920

What others are saying about OHT

"Based on the content, the presentation, the power of the search engine, and the price, it's hard to imagine why any academic library serving significant numbers of legal and history scholars wouldn't subscribe to this product. Law school libraries should arrange a trial of the database, as should firms dealing in international law. Highly recommended." -Cheryl LaGuardia, Library Journal

"In my opinion, Oxford Historical Treaties does contain enough other advantages to make the purchase worth serious consideration. Most obviously, it provides pdf images of the Consolidated Treaty Series...Anyone who is familiar with the interface of one or more of the other Oxford products will immediately recognize Oxford Historical Treaties, which will make navigation simple for users. The filters (content type, treaty type, party, date, etc) will be useful for empirical or comparative work...Most notably, Oxford Historical Treaties is integrated with the Oxford Law Citator, which links to other Oxford products, such as Oxford Reports on International Law and Max Planck Encyclopedia of Public International Law as well as commentary in Scholarly Authorities in International Law." -Ryan Harrington, DipLawMatic Dialogues


Learn more about Oxford Historical Treaties from John Louth, Editor in Chief of Academic Law at OUP, and Randall Lesaffer, the site's editor.

About Oxford Public International Law

Oxford Historical Treaties is available via the Oxford Public International Law (OPIL) platform - Oxford’s gateway for international law research. It provides scholars, practitioners, and students with a range of resources on every aspect of international law, helping them to better understand the field, answer practical questions, and identify areas for further research.

In addition to OHT, OPIL is home to the Max Planck Encyclopedia of Public International Law, Oxford Reports on International Law, and Oxford Scholarly Authorities on International Law.

Find out more about OPIL, watch the full story below:

Obtaining access to Oxford Historical Treaties

Subscriptions and 30-day free-trials are available to institutions for all of our resources. If you are an academic, professional or a student, you can recommend the service to your Librarian.