Elfrida, The First Crowned Queen of England, was released in paperback today. It's the first biography of one of England's most remarkable queens. Elfrida (or Aelfthryth as she is more correctly called) was a tenth century noblewoman who became the third wife of King Edgar. An important advocate of monastic reform, her life has been overshadowed by the murder of her stepson, King Edward the Martyr. But was Elfrida really guilty?