Conversation so far:
What was Gore Vidal's first screenplay?
Gore Vidal's first screenplay was Climax!: A Farewell to Arms.
How did Gore Vidal become involved in Ben-Hur?
In 1958, the director William Wyler required a script doctor to rewrite the screenplay for Ben-Hur, originally written by Karl Tunberg.
Was Gore Vidal work on Ben-Hur successful for him?
Yes, in exchange for rewriting the Ben-Hur screenplay, on location in Italy, Gore Vidal negotiated the early termination of his four-year contract with MGM.
Where did Gore Vidal go after the early termination of his four-year contract with MGM?
Gore Vidal occasionally returned to the movie business, and wrote historically accurate teleplays and screenplays about subjects important to him.
Were any screenplays written by Gore Vidal notable?
The Best Man: A Play about Politics and Visit to a Small Planet were theatre and movie successes.
Were any movies written by Gore Vidal notable?
The Roman Empire movie Caligula (1979), from which Gore Vidal had his screenwriter credit removed

Question: Why did he have his credit removed?
Self-contained rewrite: Why did Gore Vidal have his credit removed?