By virtue of stepping out of the chorus and creating dialogue is said to be both the first actor and playwright.

Thespis

Explanation:

According to some Ancient Greek sources, and Aristotle in particular,  Thespis was the first individual ever to appear on stage as an actor playing a  character in a play (instead of talking as himself).  

In other sources, besides the chorus, he is said to have introduced the first main actor.

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