Answer: Mary's involvement in Catholic plots
The Ridolfi plot 1571. This plot planned to depose Elizabeth and replace her with Mary as Queen. ...
Throckmorton plot 1583. Similar to the Ridolfi plot, the Throckmorton plot planned the murder of Elizabeth and her replacement with Mary. ...
The Parry plot 1585. ...
The Babington plot 1586.
Explanation: The Babington Plot 1586
A young English Catholic nobleman, Sir Anthony Babington, became the centre of a plot to assassinate Elizabeth and place Mary on the throne. Coded letters were discovered between Babington and Mary, offering to kill Elizabeth and keeping her informed of the progress of plot.