Final answer:
Antonio, the brother of Prospero, plotted to banish him and usurp the dukedom of Milan in William Shakespeare's play, The Tempest.
Step-by-step explanation:
In the context of William Shakespeare's The Tempest, it was Antonio who plotted to banish Prospero and take over his dukedom. Antonio is Prospero's brother and the usurping Duke of Milan, who conspired against him to seize the power of the dukedom for himself. This deceitful act sets the stage for the events that unfold on the magical island where the play is set.
In William Shakespeare's play The Tempest, the character Prospero was plotted against by his brother Antonio. Antonio schemes to banish Prospero and take over his dukedom by colluding with King Alonso and Sebastian. Together, they usurp Prospero's power and leave him stranded on a remote island.