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 and French have led to many "faux amis" (words having similar form but different meanings) in Modern English and Modern French. Since although a Romance language, Norman contains a significant amount of lexical material from Norse, some of the words introduced into England as part of Anglo-Norman were of Germanic origin. Indeed, sometimes one can identify cognates such as "flock" (Germanic in English existing prior to the Conquest) and "floquet" (Germanic in Norman). The case of the word "mug" demonstrates that in instances, Anglo-Norman may have reinforced certain Scandinavian elements already present in English. "Mug" had been introduced into northern