King Francis I of France signs an alliance with John Zápolya of
Hungary, which unites the two forces against the mutual Hapsburg
threat of Ferdinand of Bohemia, who is a rival claimant for
Zapolya's throne.
Citation:
Editors. "Francis I signs an alliance with John Zápolya of Hungary".
The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14468, accessed 26 May 2013.]