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 correspondence was carried out in Anglo-Norman or Anglo-French from the 13th to the 15th century though its spelling forms were often displaced by continental spellings. Social classes other than the nobility became keen to learn French: manuscripts containing materials for instructing non-native speakers still exist, dating mostly from the late 14th century onwards. Although Anglo-Norman and Anglo-French were eventually eclipsed by modern English, they had been used widely enough to influence English vocabulary permanently. Thus, many original Germanic words, cognates of which can still be found in Nordic, German, and Dutch, have been lost or, as more often occurs, exist