Peter Ustinov’s performance as Nero is outstanding; he carries this portrayal of the final days of the complicated and self-important emperor exceptionally well. Nero’s actions are somewhat restrained by Leo Genn, who plays Petronius, his advisor on artistic matters, skillfully using words and intelligence to prevent the emperor from committing truly terrible acts. Robert Taylor's take on the character "Vinicius" is fairly unremarkable, and while Deborah Kerr appears beautiful, her acting feels stiff as “Lygia,” a rather meek character. The film offers a visually rich display of the costume and set design work. Miklós Rósza’s score is appropriately majestic in this telling of how Hollywood presents the emergence of Christianity. It does feel drawn out at times, and I believe I saw Sophia Loren operating a chariot.

Source on TMDB