Legal English the history of the development of English as a legal language. In prehistoric Britain, traditional common law was discussed in the vernacular (see Celtic law). The legal language and legal tradition changed with waves of conquerors over the following centuries. Roman Britain (after the conquest beginning in AD 43) followed Roman legal tradition, and its legal language was Latin. Following the Roman departure from Britain circa 410 and the Anglo-Saxon invasion of Britain, the dominant tradition was instead Anglo-Saxon law, which was discussed in the Germanic vernacular (Anglo-Saxon, Old English), and written in Old English since circa 600, beginning with
Anglo-Norman language unique insular dialect now known as Anglo-Norman French, which was commonly used for literary and eventually administrative purposes from the 12th until the 15th century. It is difficult to know much about what was actually spoken, as what is known about the dialect is restricted to what was written, but it is clear that Anglo-Norman was, to a large extent, the spoken language of the higher social strata in medieval England. It was spoken in the law courts, schools, and universities and, in due course, in at least some sections of the gentry and the growing bourgeoisie. Private and commercial