* Sultan refers to a Muslim ruler, especially in the Ottoman Empire. It's a title, not a characteristic.
* Opposites usually describe contrasting qualities or positions.
Instead of a direct opposite, consider these options:
* Subject: A Sultan rules over a subject population.
* Rebel: Someone who opposes the Sultan's rule.
* Citizen: A member of the Sultan's territory who might not be a loyal supporter.
The best way to find the right word depends on the context of your sentence and what you're trying to express.