Anglo-Norman language
The Norman language was introduced to England during the rule of William the Conqueror. Following the Norman conquest, the Norman language became the language of England's nobility. During the whole of the 12th century the Anglo-Norman language (the variety of Norman used in England) was similar to Latin in the distinction of being the literary language of England, and it was in use at the court until the 14th century. During the reign of Henry IV, 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, the author of the "Manière de language" calls French: