Henry IV gains control over Champagne when the Duke of Guise,
stalwart of the Catholic League, gives it up to the newly
recognised King of France.
Citation:
Editors. "The Duke of Guise surrenders Champagne to Henry IV".
The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15472, accessed 25 May 2013.]