The Promptorium Parvulorum by Galfridus Anglicus, ed. Anthony Lawson Mayhew (1908)
This publication for the Early English Text Society contains The first English-Latin dictionary. Ed. from the manuscript in the Chapter library at Winchester, dating to the early 15th century, with introduction, notes, and glossaries. The text of the promptorium is quite substantial, running to over 500 pages in this edition. What a fabulous book - here's a typical entry:
Parlowre: locutorium, ij, neut 2.
Lots of fun browsing here, and some quite unusual Latin that gives you a sense of just how much Latin had "run wild" before its Renaissance standardization based on classical norms.