Leonine appears only once, in Act 4, Scene 1, as the hired assassin Dionyza sends to murder Marina. He is a servant in Cleon’s household—a man of low station, bound by oath to obey his mistress, yet capable of a moment of moral hesitation. When Dionyza commands him to kill the girl, she flatters him with promises of profit and urges him to suppress his conscience, which she dismisses as merely “cold” and ineffective. Leonine agrees to the deed, but his brief exchange with Marina reveals the tension between duty and doubt. He tells her to say her prayers, and when she asks why he would kill her, he answers with brutal simplicity: “To satisfy my lady.”
Yet Marina’s eloquence and her appeal to the goodness she perceives in him create a crack in his resolve. She notes that he has a “gentle heart,” having once been moved to tears when separating two fighting men. She asks him to stand between her and Dionyza’s malice, to “save poor me, the weaker.” In this moment, Leonine is on the verge of choice—whether to become an instrument of evil or to recover his own humanity. But the choice is taken from him. Before he can act, pirates arrive and seize Marina, driving him away. His failure to complete the murder is not the result of his courage but of pure chance. When he returns and finds Marina gone, he swears to claim she drowned or was ravished, thus protecting himself while the girl escapes to a different form of captivity. Leonine is neither hero nor villain, but a man caught between the demands of authority and the whisper of conscience, ultimately saved from damnation by accident rather than virtue.