Attainder of Guy Fawkes
This Act was passed in the immediate aftermath of the plot being discovered hence the vitriolic language of the title. Under English law the act of attainder declared a person or a group of persons guilty of a serious crime and punished them without the benefit of a judicial trial. Also the person could no longer own property or pass property to his family by will or testament.
An Act for the Attainder of divers Offenders in the late most barbarous, monstrous, detestable and damnable Treasons [Attainder of Guy Fawkes and others]
Parliamentary Archives, HL/PO/PU/1/1605/3J1n2