Erik had no trouble guessing the last History Mystery so if a 9 year old can do it, I obviously need to make it more difficult.
He and his deeds served as inspiration for the poet, John Milton, who modelled Satan in Book 6 of Paradise Lost on this character. Although he has been vilified since his treason, he is also known as, "the last man to enter (UK) Parliament with honourable intentions," and his reputation has been somewhat modified in recent years.
Who is he?
(Wed Answer: Guy Fawkes. Congratulations Julie Queen, NB for getting the right answer. You win....um....the satisfaction of knowing the right answer.)