Stranded by an ouchie and hating all my current (mostly asoiaf) drafts I'm going humble brag I have a 1968 Revised Fourth Edition Black's Law Dictionary on hand. It's 1,882 pages long. Black's Law is "Definitions of the Terms and Phrases of American and English Jurisprudence Ancient and Modern" Which means there's Anglo-Saxon and Norman legal terms n this beast of a tome, some old Scottish legal terms as well. Black's Law 2nd Edition was published in 1910 is public domain and can be found in a variety of places, formats etc There is a searchable one I know of
https://thelawdictionary.org/
So if you're wanting to know old legal terms and concepts between a century to a thousand years old that have their origins in the place we now call England you can.
