Final answer:
Courtesy was the key attribute for knights in courtly love songs and heroic legends.
Explanation:
Courtesy was the most important attribute for a knight in courtly love songs and heroic legends.
Knights were expected to display impeccable manners, politeness, and courteous behavior towards noble ladies, even in the face of challenges or adversities.
Examples from literature such as the devotion of Lancelot to Guinevere highlight the emphasis placed on courtesy in knightly behavior.
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