Anglo-Norman language general use of the word "acre" for land measurement in Normandy until metrication in the 19th century, but these words are probably linguistic traces of Saxon or Anglo-Scandinavian settlements between the 4th and the 10th centuries in Normandy. Otherwise the direct influence of English in mainland Norman (such as "smogler" - to smuggle) is from direct contact in later centuries with English, rather than Anglo-Norman. When the Normans invaded England, Anglo-Saxon literature had reached a very high level of development. The important Benedictine monasteries both wrote chronicles and guarded other works in Old English. However, with the arrival of the
Anglo-Norman language century, intermarriages with English nobility became more frequent. French became progressively a second language among the upper classes. Moreover, with the Hundred Years' War and the growing spirit of English nationalism, the status of French diminished. French was the mother tongue of every English king from William the Conqueror (1066-1087) until Henry IV (1399–1413). Henry IV was the first to take the oath in English, and his son, Henry V (1413–1422), was the first to write in English. By the end of the 15th century, French became the second language of a cultivated elite. Until the end of the 13th