The 1569 Plot was a conspiracy in Sweden in 1569. The purpose was to depose John III of Sweden and reinstate the imprisoned Eric XIV of Sweden on the Swedish throne. The plot was instigated by the courtiers of Eric's spouse queen Karin Månsdotter; her lady-in-waiting Elin Andersdotter and her personal secretary Thomas Jakobsson. It was the first of three major plots to free the imprisoned Eric XIV (followed by the Mornay Plot and the 1576 Plot), but has been described as the most serious one.
https://en.wikipedia.org/wiki/1569_Plot