Who were the two people who were plotting against the monarchy in 1605?

the people that were plotting the monarchy in 1605, well it became known, was the brainchild of Robert Catesby, a well-to-do gentleman of Warwickshire. Together with Guy Fawkes and three other plotters, they formulated a plan to strike at the opening of parliament on 5 November. With the king dead, they would put James' daughter, Elizabeth, on the throne, returning Britain to the Catholic fold.