The oldest son and sole surviving heir of Sextus Roscius (pater). Roscius (filius) has a wife and two daughters. It is revealed in the narrative that Roscius (filius) began molesting his older daughter when she was just a small girl. In addition to planning his father's murder, Roscius (filius) is responsible for the death of his younger half-brother Gaius and the death of Elena's newborn. Roscius (filius) is middle-aged. A large, muscular man, he appears uncouth and "rough-hewn," which implies a certain lack of gentility and a countrified demeanor. When Gordianus meets him at Metella's house, Roscius (filius) is stooped and seems rather frail for a man of his size. His hair and beard are scraggly and unkempt and there are dark circles under his eyes. There is nothing in the narrative to suggest that his appearances changes in any significant way either before or after his trial.