Question: Agnes Wenman, Viscountess Wenman (died 1617) was an English Roman Catholic woman, under suspicion of involvement at the time of which 1605 event, that was a failed assassination attempt against King James I of England and VI of Scotland by a group of provincial English Catholics led by who?

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Gunpowder Plot in popular culture: The Gunpowder Plot was a failed assassination attempt against King James VI of Scotland and I of England by a group of provincial English Catholics led by Robert Catesby.  The conspirators' aim was to blow up the House of Lords at the State Opening of Parliament on 5 November 1605, while the king and many other important members of the aristocracy and nobility were inside.  The conspirator who became most closely associated with the plot in the popular imagination was Guy Fawkes, who had been assigned the task of lighting the fuse to the explosives.

Thomas Percy (Gunpowder Plot): Thomas Percy (  1560 – 8 November 1605) was a member of the group of provincial English Catholics who planned the failed Gunpowder Plot of 1605.  A tall, physically impressive man, little is known of his early life beyond his matriculation in 1579 at the University of Cambridge, and his marriage in 1591 to Martha Wright.  In 1596 his second cousin once removed, Henry Percy, 9th Earl of Northumberland, appointed him constable of Alnwick Castle and made him responsible for the Percy family's northern estates.  He served the earl in the Low Countries in about 1600–1601, and in the years before 1603 was his intermediary in a series of confidential communications with King James VI of Scotland.

Thomas Bates: Thomas Bates (1567 – 30 January 1606) was a member of the group of provincial English Catholics who planned the failed Gunpowder Plot of 1605.

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: The Gunpowder Plot of 1605, in earlier centuries often called the Gunpowder Treason Plot or the Jesuit Treason, was a failed assassination attempt against King James I of England and VI of Scotland by a group of provincial English Catholics led by Robert Catesby.

Everard Digby: Sir Everard Digby (c. 1578 – 30 January 1606) was a member of the group of provincial English Catholics who planned the failed Gunpowder Plot of 1605.  Although he was raised in a Protestant household, and married a Protestant, Digby and his wife were converted to Catholicism by the Jesuit priest John Gerard.  In the autumn of 1605 he was part of a Catholic pilgrimage to the shrine of St Winefride's Well in Holywell.  About this time he met Robert Catesby, a religious fanatic who planned to blow up the House of Lords with gunpowder, killing James I.  Catesby then planned to incite a popular revolt, during which a Catholic monarch would be restored to the English throne.

John and Christopher Wright: John (Jack) Wright (January 1568 – 8 November 1605), and Christopher (Kit) Wright (1570?  – 8 November 1605), were members of the group of provincial English Catholics who planned the failed Gunpowder Plot of 1605, a conspiracy to assassinate King James I by blowing up the House of Lords.  Their sister married another plotter, Thomas Percy.  Educated at the same school in York, the Wrights had early links with Guy Fawkes, the man left in charge of the explosives stored in the undercroft beneath the House of Lords.  As known recusants the brothers were on several occasions arrested for reasons of national security.  Both were also members of the Earl of Essex's rebellion of 1601.

Robert Keyes: Robert Keyes was a member of the group of provincial English Catholics who planned the failed Gunpowder Plot of 1605, a conspiracy to assassinate King James I by blowing up the House of Lords during the State Opening of Parliament on 5 November 1605.  He was the sixth man to join the plot.

Arthur Aston: Sir Arthur Aston (died 1627) was appointed Proprietary Governor of Avalon in 1625 by Sir George Calvert, (1579-1632), former Secretary of State for Foreign Affairs to King James I of England (and earlier James VI of Scotland), (later titled first Baron and Lord Baltimore in Ireland and received charter from King Charles I of the Kingdom of England in 1632 just before his death to found colonial Province of Maryland further south along Chesapeake Bay in future United States of America, carried out in 1634 by his eldest son/heir Cecilius Calvert, second Baron and Lord Baltimore, [1605-1675], and nephew Leonard Calvert, [1606-1647], first provincial Governor of Maryland).  Aston was a devout Roman Catholic and was recommended by Father Stout to govern the Catholic colony.  Aston arrived in Ferryland, Avalon's capital, around 1626 but returned to England the next year to resign his position and join the forces of the George Villiers, first Duke of Buckingham in France, where he died the same year.

Agnes Wenman, Viscountess Wenman: Agnes, Viscountess Wenman (died 1617) was an English Roman Catholic woman, under suspicion of involvement at the time of the Gunpowder Plot of 1605.  She is correctly referred to either as Agnes Wenman or as Lady Wenman.

Supporting paragraphs: Agnes Wenman, Viscountess Wenman Gunpowder Plot
Answer: Robert Catesby