In the early hours of November 5, 1605, Guy Fawkes, an English Catholic who had served with the Spanish army in Flanders, was discovered in a storeroom under the Palace of Westminster--and with him, thirty-six barrels of gunpowder earmarked to obliterate England's royal family, top officials, and members of Parliament gathered for Parliament's opening day. Had it succeeded, this Gunpowder Plot--a Catholic conspiracy against the recently crowned...