The situation in the northwest was more complicated: Margrave Otto III of Brandenburg, using the death of Henry the Bearded as a pretext, took the important Greater Polish fortress at Santok and besieged Lubusz.
The Lebus bishops tried to maintain their affiliation with Poland and in 1276 therefore moved their residence east of the Oder river to Górzyca (Göritz upon Oder), an episcopal fief.
By conquest the first leaders of the Polans, Mieszko I and especially Boleslaw I added a number of surrounding territories to the newly established core Polish state, and Lebus Land or Lubusz in Lusatia came under Polish rule.
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In the administrative reforms of 1998, the original proposals made no provision for a separate Lubusz voivodeship – Gorzów would have been part of West Pomeranian Voivodeship, Zielona Góra would have been in Lower Silesian Voivodeship (Province of Lebus or Palatinate of Lebus) , and other parts of the region were assigned to Greater Poland Voivodeship.