The Throckmorton Plot was an attempt, in 1583, by English Roman Catholics to murder Queen Elizabeth I of England and replace her with her first cousin once removed, Mary, Queen of Scots. The plot is named after the key conspirator, Sir Francis Throckmorton (a cousin of Elizabeth "Bess" Throckmorton, Elizabeth's first lady in waiting); Francis confessed to the plot under torture.
The plot aimed to assassinate Queen Elizabeth I, who had ruled England since 1558. The Roman Catholics wished to free her cousin, Mary, Queen of Scots, who had been held under house arrest in England since 1568, to make Mary England's queen, and to legally restore Roman Catholicism. The plan envisaged coordinating the assassination with an invasion of England led by Henry I, Duke of Guise, financed by Spain and by the Pope, and a simultaneous revolt of English Roman Catholics, involving both the Jesuits and the English Cardinal Allen.
Throckmorton acted as a Spanish agent, and, due to his arrest, the plot was never put in motion.
The plot failed. The brothers Francis and Thomas Throckmorton were the two main conspirators, with Francis being the more important one. While touring Europe they became sympathetic to the exiled English Catholics’ plight and the Spanish King’s desire to return England to Catholicism. In Paris, the two brothers met up with Thomas Morgan (of Llantarnam), who put them in contact with Bernardino de Mendoza, Philip II of Spain's ambassador in London.
When Francis returned to London in 1583, he became the go-between for Mary, Queen of Scots, Morgan, and Mendoza. Queen Elizabeth's secretary of state, Francis Walsingham, discovered what Throckmorton was doing and put him under surveillance. After six months, Walsingham had him arrested.
Throckmorton managed to "destroy or send to Mendoza" some of the incriminating documents, although not all, as a list of Catholic nobles and people willing to support a Spanish invasion was discovered. Thomas managed to flee the country, but other co-conspirators were imprisoned in the Tower of London.
In January 1584, Mendoza, as an ambassador, was only thrown out of the country; he was the last of the Spanish ambassadors in the London Court during the Elizabethan era. Meanwhile, Queen Elizabeth had Throckmorton tortured into a confession of the extent of the plot. He was later executed.
In 1584, the plot resulted in the creation of the Bond of Association, a document drafted by Francis Walsingham and William Cecil, Lord Burghley, which obliged all signatories to execute anyone who attempted to usurp the throne or to assassinate the Queen.
There were no more resident Spanish ambassadors for the remainder of Elizabeth's reign.
After discovery of the plot, Mary, Queen of Scots was placed under strict confinement at Chartley Hall in Staffordshire.
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