Editors. "Lutheran deadline for conformity expires". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14469, accessed 24 May 2013.]
The previous September, the Diet of Augsburg had ordered all Lutherans to conform by 15th April 1531. Although this date had now arrived without the desired result, Emperor Charles V still baulks at taking action against them.