Courtesy
Free to read here, from Project Gutenberg.
The Book of the Courtier
A Renaissance Courtesy-book: Galateo of Manners & Behaviours
Barty Crusoe and His Man Saturday
Caxton's Book of Curtesye
Libro intitulado El cortesano. Libro de motes de damas y caballeros
Principles of politeness, and of knowing the world
Have you an educated heart?