Around the year 840, Liutbirga, the adopted daughter of a noble Saxon widow, asked to be walled into a cell in a church at one of the family's cloisters for religious women. She spent the last thirty years of her life in her cell, doing penance for her sins, fending off attacks by the devil, and instructing women in religion and handiwork through its one small window. Hathumoda, the daughter of a noble Saxon couple whose progeny would establish the...