What is "igraine"

In Arthurian legend, Igraine is the mother of King Arthur. She is also known in Latin as Igerna, in Welsh as Eigyr, in French as Igerne, in Thomas Malory's Le Morte d'Arthur as Ygrayne— often modernized as Igraine—and in Wolfram von Eschenbach's Parzival as Arnive. She becomes the wife of Uther Pendragon, but her first husband was Gorlois; her daughters by Gorlois are Elaine, Morgause and Morgan le Fay.