“ As a punishment, Anna, with her mother, was shut up in a convent, where she remained until the death of her brother in 1143. The date of her death is unknown, but she was still at work on her history in 1148. She entitled this work the Alexiad. The first two books treat of the history of the Empire from the time of Isaac Comnenus; the remaining thirteen books are devoted to the reign of Alexius. Chronologically, Anna is sometimes at fault, and she omits purposely many events; but as a whole her work has great merit. ”