What failed plot to kill James I did Robert Catesby attempt to carry out?
Everard Digby:  About this time he met Robert Catesby, a religious fanatic who planned to blow up the House of Lords with gunpowder, killing James I. Robert Catesby: Robert Catesby (born in or after 1572, died 8 November 1605) was the leader of a group of provincial English Catholics who planned the failed Gunpowder Plot of 1605.
Gunpowder Plot of 1605