Counts of Stade
The Counts of Stade were members of the Saxony nobility beginning in the 10th century. Stade had developed since the 8th century as a principal center of trade and communications. The Counts of Stade created their domain between the lower Elbe and Weser rivers. They extended their power northwards with the acquisition of Dithmarschen in the 11th century. They became the Margraves of the Nordmark (Northern March) in 1056. There is also a close political and familial relationship between the Counts of Stade and the Counts of Walbeck. The Northern March was replaced with the March of  Brandenburg by Albert the Bear in the 12th century. The family of Counts of Stade is referred to as the House of Udonids. The principal sources for the Counts of Stade are the Deeds of the Saxons by Widukind of Corvey, the Annals of Fulda, the anonymous "Annalista Saxo," and "Chronicon Thietmari" "by" Thietmar of Merseburg. Thietmar was the great-grandson of Lothar II, Count of Stade, and Lothar I, Count of Walbeck, both killed fighting the Slavs at the Battle of Lenzen in 929. The Counts of Stade were: The precise dates of reign are confusing from 1106 until  1135, as the rightful heir Henry IV was not yet of age and the nondynastic Frederich was brought in. The titles of Count of Stade and Margrave of the Nordmark were also not interchangeable during this period, causing further uncertainty. The Counts of Stade are also closely tied to, and sometimes rivals with, the Counts of Walbeck. The family tree of the descendants of Lothar II and their relationships with the House of Billung, in particular with Wichmann, can be found in Warner’s book on Ottonian Germany. Wichmann's ties with the Margraves of the Nordmark, particularly with his  grandson Dietrich, the first Margrave of the Nordmark, provide some credence to these claims. After the death of Rudolf II in 1144, his brother and successor Hartwig transferred his inheritance to the archbishopric of Bremen in return for a regrant of a life interest, presumably to obtain a powerful protector against the aggression of Henry the Lion. The move was ineffective, as Henry took possession of the lands and captured both Hartwig and the archbishop Adelbero, releasing them only after they agreed to recognize his claim.