 For the earlier part he used Widukind's "Res gestae Saxonicae", the "Annales Quedlinburgenses" and other sources; the latter part is the result of personal knowledge.The chronicle is nevertheless an excellent authority for the history of Saxony during the reigns of the emperors Otto III and Henry II.No kind of information is excluded, but the fullest details refer to the bishopric of Merseburg, and to the wars against the Wends and the Poles.