 Later authors use her good and bad qualities to construct a deeper character who plays a larger role in the stories.In Chrétien's "Yvain, the Knight of the Lion", for instance, she is praised for her intelligence, friendliness, and gentility.On the other hand, in Marie de France's probably late-12th-century Anglo-Norman poem "Lanval" (and Thomas Chestre's later Middle English version, "Sir Launfal"), Guinevere is a vindictive adulteress and temptress who plots the titular protagonist's death after failing to seduce him.