Submitted to the British Board of Film Censors on 26 August 1964 when it was passed with a "U" certificate under the title Battle of the Spartans. Not generally released on the major ABC or Rank circuits, but distributors Regal Films International circulated as many prints as possible. The ITV network eventually acquired the film and its television premiere (under the title Brennus, Enemy of Rome) was on 16 December 1991 on Yorkshire Television who screened it as the seventh and last in their "Roman Follies" series, a light-hearted season of the worst of the Italian epics.
First televised 24 May 1964 on channel seven in New York.