The Peace of Oliva is signed through French mediation, ending war
between Brandenburg, Poland, Austria and Sweden. Its terms
recognise the Elector of Brandenburg's sovereignty in East Prussia,
and force John Casimir II of Poland to renounce his claim to the
Swedish throne and to Estonia and Livonia. Sweden and Poland
recognise the sovereignty of Russia.
Citation:
Editors. "Peace of Oliva ends war between Brandenburg, Poland, Austria and Sweden".
The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16460, accessed 21 May 2013.]