Like Macbeth from an earlier play, Antonio’s besetting vice is unholy ambition. His jealousy over what was rightly his brother’s caused him to usurp his own kin. Antonio’s ambition was prized even over brotherly love, and his family was ravaged because of it. Antonio lost the chance to see his niece grow up so that he might wear a piece of metal on his head. He allowed his ambition––which can be good––to unrightly vault over his love of family. And like Macbeth, Antonio was not content to stop at one attempted murder, but tried again with the traitorous Sebastian. Antonio’s admission of sin opened him up to being dominated by it again.