Works of satire, like those written by the Roman author Juvenal, are stories that

The answer is: make fun of the subject

The satire that was made by Juvenal made fun a lot of people (including those who had high power) in roman society.

Satires such as The Emperor's Fish, or True Nobility made fun a lot of fake bravado and charisma that people in high power tried to impose at the time. Since he wrote it in such a funny way, many people who read it could easily relate to his opinion and made him really popular.

Works of satire, like those written by the Roman author Juvenal, are stories that make fun of the subject.