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Knights of the late medieval era were expected by society to maintain all these skills and many more, as outlined in Baldassare Castiglione's The Book of the Courtier, though the book's protagonist, Count Ludovico, states the "first and true profession" of the ideal courtier "must be that of arms."[40] Chivalry, derived from the French word chevalier ('cavalier'), simultaneously denoted skilled horsemanship and military service, and these remained the primary occupations of knighthood throughout the Middle Ages.

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Knights were expected, above all, to fight bravely and to display military professionalism and courtesy. When knights were taken as prisoners of war, they were customarily held for ransom in somewhat comfortable surroundings. This same standard of conduct did not apply to non-knights (archers, peasants, foot-soldiers, etc.) who were often slaughtered after capture, and who were viewed during battle as mere impediments to knights' getting to other knights to fight them.