She is the reincarnation of Guinevere from which Queen Guinevere of Arthurian Legend was inspired, who was herself the reincarnation of an Earth Mother Goddess. What is known is that she is searching for the most mysterious of the Gods of Steel, the King Who Manifests at the World's End, who inspired the legends of King Arthur, and she possesses the Holy Grail, which was crafted by her in her previous life as a Heretic God, Gwenhwyfar. She is also allied to the Heretic God, Lancelot du Lac.
It was mentioned by Artio that he was the proxy of Artos.
The two appear to be close friends.