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 Anglo-Norman, but that usage is derived from the French name for the islands: "îles anglo-normandes". The variety of French spoken in the islands is Norman and not the Anglo-Norman of medieval England. Anglo-Norman was never the main administrative language of England: Latin was the major language of record in legal and other official documents for most of the medieval period. However, from the late 12th century to the early 15th century, Anglo-Norman French and Anglo-French were much used in law reports, charters, ordinances, official correspondence, and trade at all levels; they were the language of the King, his court and