Bisclavret by Marie de France

In this medieval Breton lai, a noble knight harbors a secret that he transforms into a werewolf for three days each week. Trusting his wife with this revelation, he is betrayed when she conspires with another knight to trap him in his lupine form by stealing his clothes, the key to his transformation back to human. Abandoned and heartbroken, the werewolf's plight is eventually discovered by the king, who recognizes the creature's noble nature and helps restore him to his human form. Justice is served as the treacherous wife and her accomplice face the consequences of their betrayal, highlighting themes of loyalty, betrayal, and redemption.

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