The Throckmorton Plot of 1583 aimed to replace Elizabeth with Mary. In 1583, the Pope, Philip II of Spain and a French Catholic had a plan with Francis Throckmorton, to place Mary on the throne but Walsingham's spies uncovered the plot and Throckmorton was arrested. In 1586, Anthony Babington communicated with Mary about a plot to kill Elizabeth. They were unaware that their notes was intercepted by Walsingham's spies providing evidence of Mary's guilt. Mary was put on trial, found guilty of treason and executed in February 1587.