Men of Iron - The Black Shield of Falworth
This novel was the inspiration for the Tony Curtis, Janet Leigh movie, "The Black Shield of Falworth." It depicts the struggle of a young Myles Falworth to learn the truth about his family's disgrace in mediaeval England during the reaign of Henry IV, and his training as first a squire and then as a knight to prepare him to avenge his father's honor and restore the family name of Falworth onto the roster of English chivalry.
The movie version heightens the story's drama by adding a second love interest for Myles' friend and by increasing the stakes by making the villain an outright traitor with plans to overthrow King Henry. It also includes Prince Hal, in a role which helps to uncover the plot and assists in advancing the fortunes of young Myles.
The book was very informative regarding the training, habits, and mores of that era in English history.