After the House of Commons fails to impeach Thomas Wentworth, Earl of Strafford, they vote through a Bill of Attainder which allows them to rule his execution.
Editors. "Act of Attainder against the Earl of Strafford". The Literary Encyclopedia. First published 01 March 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=2211, accessed 01 April 2015.]