 During the Middle Ages, this grew from simple military professionalism into a social code including the values of gentility, nobility and treating others reasonably.In "The Song of Roland" (c. 1100), Roland is portrayed as the ideal knight, demonstrating unwavering loyalty, military prowess and social fellowship.In Wolfram von Eschenbach's "Parzival" (c. 1205), chivalry had become a blend of religious duties, love and military service.