Who is Antonio from A Tempest: Based on Shakespeare's The Tempest, Adaptation for a Black Theatre and what is their importance? "A_Tempest:_Based_on_Shakespeare's_The_Tempest

Antonio is Prospero's brother and the usurping Duke of Milan after he conspires with Alonso to denounce Prospero to the Holy Inquisition for sorcery. After being shipwrecked on the Island, he repents of his crimes against his brother, earning Prospero's forgiveness.