A letter addressed by Werner to Archbishop
Siegfried I of Mainz in 1074 or 1075 is an important source on the early phase of the revolt and the rebels' thinking. According to Werner, Henry IV seized the Saxon princes' lands arbitrarily and "not because of any fault on our part", but in order to reward the less wealthy members of his household (
familiares), and then "fortified the more inaccessible places in our region with very strong castles." Henry's "personal garrisons" he even accused of "kill[ing] those who wished to defend their liberty." Werner blamed the desecration of graves in the
Harzburg on "peasants with [their] characteristic ignorance." He was not only interested in defending the rebels' actions, however, but in averting the coming royal expedition. He asked Siegfried to intercede for the Saxons with the king. In the spring of 1075, according to Bruno, Henry IV was willing to reconcile with Werner and the other Saxon rebels on the condition that they hand over Burchard of Halberstadt and the other major conspirators. Since he would not guarantee a trial before their peers, his offer was rebuffed. The rebels were crushed at the
battle of Homburg on 9 June and the main rebels surrendered to the king in late October. Werner was imprisoned in Goslar. In the summer of 1076, Henry released Werner as a show of goodwill, perhaps at the insistence of
Pope Gregory VII. This move failed to calm the Saxons or to convert Werner, who immediately joined
a new revolt. In March 1077, he was one of the electors of
Rudolf of Rheinfelden as anti-king. He was one of those clergymen who fled at the start of the
battle of Mellrichstadt on 7 August 1078, causing Rudolf's army to panic. In the defeat, Werner was killed. He was buried in the in Magdeburg, to which he had shown favour. Assessments of Werner's pontificate have generally been negative. The author of the
Gesta archiepiscoporum Magdeburgensium referred to "the harm inflicted on [the] church" by Werner. He has been compared unfavourably to Burchard, who had skills commensurate with his office. Werner is described as "a shadowy figure" compared to his "astute and energetic" nephew, although he had brought some benefit to his church from royal generosity during the first decade of his episcopate. Overall, his pontificate was "not a blessing" for the church. ==Notes==