<P> The lord of Caerwent, a rich old man, marries a beautiful young woman . He fears that she will be unfaithful to him, so he imprisons her in a tower and assigns his aged sister to watch over her . As the years go by, she laments her situation and stops taking care of herself, making her beauty fade away . One day, she cries out to God, wishing that she could experience a romantic adventure as she has heard in fairy tales . Suddenly, a dark bird resembling a goshawk appears at her window . The bird transforms into a handsome knight named Muldumarec . Muldumarec declares his love for her and reveals that, while he has loved her from afar, he could only approach her once she had called for him . The woman refuses his advances unless he can prove that he was not sent by the devil to lead her astray . Muldumarec says that he is a Christian, and as proof of such, he assumes the woman's shape and receives the Eucharist . </P> <P> When the rich lord is away, the knight arrives by the window, in the same way he first appeared . The woman glows with her newfound love . The other people of the household become suspicious of her renewed beauty and put her under discreet surveillance . When the jealous husband learns of the shapechanging knight, he surrounds the window with iron spikes . The next time the knight arrives, he is mortally wounded . He tells the woman that their unborn child, whom she is to name "Yonec", will grow up to avenge their deaths . The knight flies away, and the woman hurls herself from the window and follows a trail of blood to a city made of silver . After passing through a succession of rooms, she eventually finds the knight on his deathbed . He gives her a magic ring that will make her husband forget about her infidelity . He also gives her his sword . As the woman flees the city, she hears the bells tolling for her lover's death . </P> <P> As prophesied, the lady gives birth to a child, and names him "Yonec". When the child is grown, the husband, the lady, and Yonec travel to an abbey, where they see a beautiful tomb . They ask the abbot about the tomb, who explains that this is the tomb of Muldumarec . At this time, Yonec's mother tells him of his true parentage, and gives him his father's sword . She collapses and dies . Yonec kills his stepfather with the sword, thus avenging his real parents . He buries his mother alongside his father, and Yonec becomes the new lord of Caerwent . </P> <P> The motif of a lover visiting in the form of a bird draws upon a common folklore motif, as in Child ballad 270, The Earl of Mar's Daughter . It also features in the Italian fairy tale The Canary Prince . </P>

How does the woman in yonec avenge her oppressive husband