Generate a question that has the following answer: Nero for the following movie plot: The central plot in the movie revolves around the love of a Roman patrician, Marcus Vinicius, towards a Christian girl (coming from the territory of modern-day Poland) set against the backdrop of the persecutions against Christians during the reign of Nero. In the beginning, Lygia, a Christian and hostage of Rome, becomes the object of Vinicius' love but she refuses his advances. Vinicius' friend Petronius tries to manipulate Nero, who has authority over all Roman hostages, to give Lygia to Vinicius, but Lygia is taken into hiding by Christians. Marcus Vinicius decides to find her and force her to be his wife. He goes to a Christian meeting along with Croton, a gladiator, to find her. After following her from the meeting, Marcus tries to take her, but Ursus, a strong man and friend of Lygia, kills Croton. Marcus himself is wounded in the fight, but is taken care of by Lygia and the Christians. Seeing their kindness he begins to convert to Christianity, and Lygia accepts him. Rome catches fire while the emperor, Nero, is away. Nero returns and sings to the crowd, but they become angry. At the suggestion of Nero's wife, the Christians are blamed for the fire, providing a long series of cruel spectacles to appease the crowd. In one of the spectacles, Ursus faces a bull carrying Lygia on its back. Ursus wins and, with the crowd and guards in approval, Nero lets them live. Nero kills himself, and Vinicius and Lygia leave Rome.
The answer to this question is:
Who did Marcus attempt to convince to give him Ligia as a slave?