Editors. "Elector of Brandenburg and Duke of Liegnitz agree to mutual succession". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14593, accessed 19 June 2013.]
Joachim II, Elector of Brandenburg, and the Duke of Liegnitz sign a treaty which plans for a mutual succession in case one or other of them fails to provide an heir for their territories.