Editors. "Frederick of Brandenburg restores Schweibus to Empire". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16909, accessed 31 March 2015.]
Frederick of Brandenburg restores Schweibus (Swiebodzin, in present-day Poland) to the Holy Roman Empire, thereby reviving his claims to the territory of Silesia.
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