Fairies are one of the most important elements of Arthurian fantasy. They are supernatural beings of Celtic origin, often fatal women, whose figures are an extension of the nymphs and goddesses of antiquity. Knights searching for adventures meet these women with strange powers in the dark and deep forests but also in the castles that stand on their roads. Beneficial or malicious, they often hide their nature under the guise of a virgin in distress in order to test the bravery and virtue of the knights. Among these fairies, Viviane plays a prominent role. The Lady of the Lake, called Niniène or Niniane in medieval texts, embodies the traditional water fairy. It is she who spirits away the newborn Lancelot to keep him and raises him in her domain of the Lake, sheltered from the world. Once he is knighted, she will always keep an eye on her protégé, whom she will save several times from madness. - Danielle Quéruel of the Bibliothèque nationale de France