There is no agreed definition of who is included in the list of regicides. The Indemnity and Oblivion Act did not use the term either as a definition of the act, or as a label for those involved. "Regicide" has never been a specific crime in English law, and has never been defined in law. Historians have identified different groups of people as being suitable for the name, and some do not include the associates who also faced trial and punishment.