Editors. "Protestant princes ordered to conform by 15th April 1531". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14451, accessed 01 August 2015.]
The Diet of Augsburg rules that the Protestant princes of Germany must conform, by disowning their heretical attachment to Martin Luther and his doctrines, by 15th April 1531.
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