Law French is an archaic language originally based on Anglo-Norman, but increasingly influenced by Parisian French and, later, English. It was used in the law courts of England, since the 13th century. Its use continued for several centuries in the courts of England and Wales and Ireland. Although Law French as a narrative legal language is obsolete, many individual Law French terms continue to be used by lawyers and judges in common law jurisdictions.

Middle English is a form of the English language that was spoken after the Norman Conquest of 1066, until the late 15th century. The English language underwent distinct variations and developments following the Old English period. Scholarly opinion varies, but Oxford University Press specifies the period when Middle English was spoken as being from 1100 to 1500. This stage of the development of the English language roughly followed the High to the Late Middle Ages.