Morgan le Fay is said to originate from Celtic mythology. In medieval novels, she is generally presented as the wife of King Urien and the mother of Yvain. At one time she is also linked to the Welsh goddess Modron, considered the mother goddess. Modron was the mother of Mabon who was stolen from the goddess when he was 3 days old. The boy was later saved by King Arthur who then included him in his group. It is possible that Morgan le Fay is a model taken from the existing goddess Modron due to the mythological fact that Modron was impregnated by King Urian (Morgan's husband) and that she fathered twins Owain and Morvydd who are all two of the Arthurian figures. Researchers such as Norris Lacy American Scholar and Professor of French and Medieval Studies at Pennsylvania State University believe these connections prove that Morgan is the incarnation of the Welsh goddess Modron. Morgan le Fay can be found in Geoffrey of Monmouth's Vita Merlini (c. 1150) and this is the earliest known reference to her. In Geoffrey of Monmouth's Vita Merlini, she has the ability to change shape at will; she can be young, an object, and old, beautiful, ugly or even an animal. She is described as the leader and most beautiful of the other sisters. In Vita Merlini, there is no relationship between Arthur and Morgan other than the fact that she is his healer. Geoffrey of Monmouth was the first to write about her as a healer, a role which became part of her identity in later Arthurian works. Chrétien de Troyes is probably the first writer to identify Morgan as Arthur's sister. She appears in Chrétien's poems as a magical healer who cures the illnesses of Erec and Enide and the madness of Yvani. In Erec and Enide, she is not only ...... middle of paper ...... uh from Morgan le fay completely changed from a healer to a more "vengeful and evil" character. In the anonymous 14th-century poem “Sir Gawain and the Green Knight,” she was the instigator who began and moved the story forward. Sir Gawain and the Green Knight, one of the alliterative novels of 14th-century Middle English, told the story of a game of beheading that was used to emphasize the importance of honor, chivalry, and masculinity. The poem, part of the Arthurian stories, introduces the character of Morgan the Fairy who sets the story in motion (by sending the Green Knight) by wanting to humiliate Arthur's court and frighten his wife Guinevere. The character of Morgan Le Fay tells a story that has survived for years and is still revered as one of the best poems. In Sir Gawain and the Green Knight, Morgan le Fay redefines the way masculinity is perceived in the Arthurian era.