Editors. "Carthusian monks are found guilty of treason". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14539, accessed 22 May 2013.]
In London, the Prior of the Charter house, John Houghton, and other Carthusian monks are found guilty of treason, since they refuse to acknowledge the royal supremacy in contravention of the authority of the Pope. On 4th May, they are executed at Tyburn.