When you think of the Gunpowder Plot of 1605, you typically think of Guy Fawkes, but it was in fact Robert Catesby who masterminded the plot to blow up the House of Lords, and thus King James I, during the State Opening of Parliament. Gunpowder, a three-part series which aired will air on HBO next month, will dive into the events which lead to the plot and stars Kit Harington as Robert Catesby.