Etheldreda, Princess of East Anglia, Queen of Northumbria and Abbess of Ely, was a remarkable woman who lived in restless, violent times when old beliefs were dying and new ones were struggling to emerge. Pagan clashed with Christian as the seven kingdoms of the Germanic tribes warred against each other and against the native Celts. Occasionally an uneasy peace was bought by the skilful use of the 'diplomatic marriage', and twice Etheldreda,...