How do you say i am a king in french?

"I am a king" in French can be said in a few ways, depending on the context and formality:

Formal:

* Je suis un roi. (Most common and literal translation)

* Je suis le roi. (Emphasizes being *the* king)

Informal:

* Je suis un vrai roi. (Emphasizes feeling like a king)

* Je suis un king. (Using the English word)

Humorous:

* Je suis le roi du château. (I'm the king of the castle)

The best way to say it depends on the situation and your desired tone.