Thietmar
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Thietmar (modern spelling Dietmar), (969-December 1, 1019) was bishop of Merseburg and a chronologist. His chronicle covers the history of 908 till 1018 of Merseburg, Saxony and the Wenden wars and relationship with Poland. He was an enemy of Poland and strongly criticized friendly policies of some emperors towards Poland, especially the Meeting in Gniezno.