As a general rule, a book of etiquette is a mark of a dynamic rather than a stable society, one in which there is an influx of "new" men, who have not been indoctrinated with the correct decorum from an early age and who are avid to catch up in a hurry.
Civilized Man is a 3000-line Latin verse poem that gives proper advice on a wide range of social situations that the typical medieval person might have encountered in day-to-day life.
Examples include: Historians believe that Daniel of Beccles may have been a member of Henry II's court.
John Bale (16th century) wrote that he had seen a document showing Daniel in Henry's court for over 30 years.
This can be seen in the opening lines of the poem "Reader, if you wish to be adorned with good manners, if you wish to be respected and lead a civilized life as a noble householder...".
In other words, it addresses a very minor upper percentage of the general population who own households and have servants, the class that from the 16th century might be identified as "country gentry".