Frederick of Brandenburg restores Schweibus (Swiebodzin, in
present-day Poland) to the Holy Roman Empire, thereby reviving his
claims to the territory of Silesia.
Citation:
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 22 May 2013.]