Conversation so far:
What can you tell me about the film Caligula's development?
Vidal's screenplay had a strong focus on homosexuality, leading Guccione to demand rewrites which toned down the homosexual content for wider audience appeal.
What idea did Guccione have in mind for the screenplay of the film Caligula?
Guccione was concerned that Vidal's script contained several homosexual sex scenes and only one scene of heterosexual sex, which was between Caligula and his sister Drusilla.
Where was the film Caligula developed?
Principal photography for the film Caligula began in 1976 in Rome.

Question: why was it developed there
Self-contained rewrite: why was the film Caligula developed in Rome