It can be said that chivalry affected the characters when the Knights exhibited their behavior. The Green Knight challenged the knights´honor and so Sir Gawain asked the King to accept that challenge. It seems that he wanted to show his loyalty (value of Chivalry) to King Arthur. Later on, the Green Knight promised to keep his word (value of Chivalry).
An American Thoroughbred.
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The line given above that reveals a dramatic irony is that "The responsible party is a god." It could not be a woman because it is describing death nor it is not dead yet. It clearly says that death itself is a god and no one has ever felt that they could love death even if most of them wanted to die.
Its called a "Thesaurus" it has antonyms, synonyms, and sometimes rhymes.