Robert Catesby

 Robert Catesby was the mastermind behind the Catholic Gunpowder Plot of November 1605.

Biography
In 1601, Catesby joined the Earl of Essex in rebellion against Elizabeth I, the Queen of England. As a result of this, he was imprisoned, fined 4,000 marks and also lost his estate.

As part of his plot to blow up Parliament and kill James I inside in order to put Princess Elizabeth on the throne as a puppet Catholic monarch, in 1605, he met with the Eleventh Doctor, who had infiltrated the Catholic plotters. Fooled by the Doctor's credentials (in reality psychic paper), he asked the Eleventh Doctor, who was secretly stopping this plot, to give him a sleeping draught to use on the young Elizabeth when they kidnapped her. (VG: The Gunpowder Plot)