Between 1012 and 1018 Thietmar, while Bishop of Merseburg, composed his chronicle Chronicon Thietmari, which comprises eight books, that cover the period between 908 and 1018, the Saxon Emperors Henry the Fowler, the three Ottos, and Henry II the Saint.
The chronicle is nevertheless an excellent source for the history of Saxony during the reigns of the emperors Otto III and Henry II.