Constantine is fighting against Barbarians with his father when he is called to Rome. In his way to Rome, he falls in an ambush planned by Maxence, who wants to become emperor.
A powerful man posing as a gladiator in Rome's fourth century discovers a plan to put the beautiful Queen in prison, which he thwarts by exposing a sinister duke as a traitor.
The film, set almost entirely in New York, tells of the life of some young people of the late Sixties: of the use they make of various drugs, including the terrible LSD, of their sex life and their freedom of costume and thought.
