OAKLAND — Though Patricia Bracewell spent most of her years in the field of English, teaching literature and composition, the past decade has seen her equally immersed in Anglo-Saxon England, researching the first 30 years of a queen no one has ever heard of, but one whose marriage set in motion events that led to the Norman Conquest.Wanting to share this remarkable woman, the Rockridge author has written “Shadow on the Crown,” a novel based on real events set in 11th century England.