The answer to the question: Who does the schoolmate of the saintly Christian have killed? is inside the article: The story is set in Rome the early 4th century AD, during the time of the persecution of Christians under the Roman Emperor Diocletian. The heroine of the book is Fabiola, a young beauty from a noble Roman family. She is spoiled by her father Fabius, who cannot deny her anything. Fabiola seems to have everything, including a superior education in the philosophers, yet under the surface, she is not content with her life. One day, in a fit of rage, she attacks and wounds her slave girl Syra, who is a secret Christian. The proud, spoiled Roman girl is humbled by Syra's humility, maturity and devotion to her in this situation, and a slow transformation begins, which finally culminates in her conversion to Christianity, brought on by Syra and of her own cousin Agnes, whom she adores and dotes on. Another thread of the story deals with the young boy Pancratius, a pious Christian and son of a martyr, who is himself preparing for martyrdom. Pancratius' nemesis is Corvinus, a bullying schoolmate who is irritated by the young Christian's saintliness. He does everything to bring him and the Christian community of the catacombs of Rome down. This includes the orchestrating of the lynching of their former teacher Cassianus, who is secretly Christian. Yet Pancratius shows his enemy the meaning of Christian forgiveness when he saves his life shortly after Corvinus had Cassianus killed. Another major villain in the story is the enigmatic Fulvius, an apparently rich young man from the East who soon reveals himself to be a hunter of Christians who turns them in to the authorities for money. His aim on the one hand is to gain the hand of either Fabiola or Agnes, and on the other hand, to uproot the Christian community in Rome. After some dramatic events that reveal his surprising connections to Syra, who is his long-lost younger sister Myriam, Fulvius rejects his evil ways, converts to Christianity and becomes a hermit., can you guess it ?
Cassianus