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 century, Latin was the language of all official written documents. Nevertheless, some important documents had their official Norman translation, such as the Magna Carta signed in 1215. The first official document written in Anglo-Norman was a statute promulgated by the king in 1275. Thus, from the 13th century, Anglo-Norman became used in official documents, such as those that were marked by the private seal of the king whereas the documents sealed by the Lord Chancellor were written in Latin until the end of the Middle Ages. English became the language of Parliament and of legislation in the 15th century, half