All 3 Uses

chivalry
in
The Legend of Sleepy Hollow
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In the porkers he saw carved out the future sleek side of bacon, and juicy relishing ham; not a turkey but he beheld daintily trussed up, with its gizzard under its wing, and, peradventure, a necklace of savory sausages; and even bright chanticleer himself lay sprawling on his back, in a side dish, with uplifted claws, as if craving that quarter which his chivalrous spirit disdained to ask while living.†
Brom, who had a degree of rough chivalry in his nature, would fain have carried matters to open warfare and have settled their pretensions to the lady, according to the mode of those most concise and simple reasoners, the knights-errant of yore,—by single combat; but Ichabod was too conscious of the superior might of his adversary to enter the lists against him; he had overheard a boast of Bones, that he would "double the schoolmaster up, and lay him on a shelf of his own schoolhouse;" and he was too wary to give him an opportunity.†
The British and American line had run near it during the war; it had, therefore, been the scene of marauding and infested with refugees, cowboys, and all kinds of border chivalry.†
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Definitions:

(1) (chivalry)
the medieval principles governing knightly conduct such as honor, kindness, bravery, and protection of the weak

or:

courtesy -- especially of men towards women
(2) (meaning too rare to warrant focus)
Much less commonly, "chivalry" may reference a group of elite medieval fighters.