Editors. "Borromean League of Seven Swiss Catholic Cantons is formed". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15328, accessed 18 April 2014.]
Colonel Ludwig Pfyffer forms the Borromean League of the Seven Swiss Catholic Cantons, which is also known as the Golden League. This almost leads to a split in the Swiss Confederation on religious lines, especially when the League makes an alliance with Philip II of Spain the following year.