Editors. "Treaty of Freiburg pledges 'perpetual peace' between French and Swiss". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14237, accessed 20 December 2013.]
France and Switzerland sign a treaty of perpetual peace at Freiburg, which remains in force for over 250 years, until the French Revolution in 1789.