The Ridolfi Plot (1571): Involved an Italian banker, the Pope, and King Philip II of Spain. The goal was to assassinate Elizabeth, launch a Spanish invasion, and put Mary on the throne married to the Duke of Norfolk.
The Throckmorton Plot (1583): A plan for a French invasion financed by Spain to overthrow Elizabeth. Its failure led to increased surveillance of Mary and the signing of the Bond of Association by English nobles.
Common Motives: Each plot shared the core objectives of restoring Catholicism to England and placing Mary on the throne as a legitimate, Catholic monarch.
The Conspiracy: Anthony Babington plotted to murder Elizabeth and rescue Mary. To secure Mary's cooperation, he communicated with her via coded letters hidden in beer barrels.
Walsingham's Espionage: Elizabeth's spymaster, Francis Walsingham, intercepted these letters. He used a double agent and a cryptanalyst to decipher the messages.
The Evidence: Walsingham waited until Mary wrote the "Gallows Letter," which explicitly approved of the plan to assassinate Elizabeth. This provided the absolute proof needed for a trial.
The Trial: Mary was tried for treason at Fotheringhay Castle. She argued that as a foreign queen, she was not subject to English law, but she was found guilty.
The Death Warrant: Elizabeth hesitated for months to sign the warrant, fearing that killing a divinely appointed queen would encourage others to attack her own life. She finally signed it in February 1587.
Final Moments: Mary was executed on February 8, 1587. She dressed in red (the Catholic color of martyrdom) to send a final message to her supporters.
Removal of the Figurehead: The execution removed the primary focus for Catholic rebellion within England, stabilizing Elizabeth's domestic rule.
International Escalation: The death of a Catholic queen outraged King Philip II of Spain, serving as a primary justification for the launch of the Spanish Armada in 1588.
Religious Martyrdom: Mary became a martyr for the Catholic cause, but her death ensured that her son, James VI of Scotland (a Protestant), remained the primary heir to the English throne.
Key takeaway: Mary's threat was multidimensional: religious (Catholic), political (lineage), and international (Spain/France).