A Question of Honor: A Guidebook to Knights (2003)

From the Publisher:

The imagery of knighthood exemplifies the epitome of courage, gallantry, honor, and valor beyond normal standards of any individual. Literature, as well as motion pictures, revealed the mighty prowess of the mounted soldier, whether through conquest, glory, religious beliefs, or greed.

This book enables a player to add a certain depth to a fighter, bard, paladin, cleric, and even a rogue character. It also furthers to enrich any fantasy world with societies, crusades, and emerging brotherhoods.