Final answer:
Cleopatra joined a political and romantic alliance against her husband's interests by partnering with Julius Caesar and Marc Antony, making her the commander who joined a rebellion against her own husband.
Step-by-step explanation:
The commander who joined a rebellion against her own husband is Cleopatra. Although Cleopatra did not physically take up arms in rebellion, her political and romantic alliances were in direct opposition to her husband's interests. She was married to her brother, Ptolemy XIII, and later to another brother, Ptolemy XIV, in accordance to Egyptian tradition. However, her liaisons with Roman leaders Julius Caesar and Marc Antony were strategic moves to maintain power and authority, often at the expense of her co-ruling husbands. Specifically, her partnership with Marc Antony can be seen as a form of rebellion, as it directly conflicted with the interests of her husband, Ptolemy XIII, and Rome, especially after Caesar's assassination.