Ygraine Pendragon

Igraine Pendragon (nee De Bois) was the queen of Camelot through her marriage to the king, Uther Pendragon. She was unable to bare children; when the sorceress Nimueh came to Uther saying that she could help Igraine conceive a son, he agreed. Their son was Arthur Pendragon. Igraine died in childbirth; Uther blamed Nimueh for her death and set about attacking all kinds magic there afterwards. (Excalibur)