Final answer:
The three men who usurped Prospero from his Dukedom in "The Tempest" are Alonso, Sebastian, and Antonio.
Step-by-step explanation:
The statement is true.
In William Shakespeare's play The Tempest, the three men who conspired to usurp Prospero from his Dukedom are indeed Alonso, Sebastian, and Antonio.
For example, in Act II, Scene I of the play, Sebastian and Antonio discuss their plan to kill Alonso and take over his kingdom: 'Think but this, and all is mended, / That you have forfeited your peace with / Those feathered messengers for yourselves, so / They have cleared, and now I'm ready to plot.' Throughout the play, these three characters engage in actions that ultimately lead to their downfall and the restoration of Prospero to his rightful place as Duke of Milan.