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 literature of Henry IV that English became the native tongue of the kings of England. The language had undergone certain changes which distinguished it from the Old Norman spoken in Normandy, as can be seen from graphical characteristics, from which certain rules of pronunciation are to be inferred. An Anglo-Norman variety of French continued to exist into the early 15th century, though it was in decline at least from the 1360s, when it was deemed insufficiently well known to be used for pleading in court. Great prestige continued to be enjoyed by the French language, however; in the late 14th century,