The practical establishment of the right of appeal ordinarily led the magistrate in the exercise of his disciplinary power to substitute light fines and imprisonment, which he had full power to enforce, for the heavier penalty of scourging.[1462] But in case of crimes, especially perduellio and parricidium, public sentiment compelled him to prosecute the accused to the full extent of the law. In the former accusation the consul of the early republic appointed duumviri perduellioni iudicandae for each case as it arose.[1463] This office is obscure because, without being formally abolished, it fell early into disuse, its function passing to the tribunate of the plebs. Of the three cases attributed by the sources to these duumviri, that of Horatius[1464] belongs to the regal period, and is a mythical prototype of the republican procedure. The offence has the appearance of parricidium. Only by the broadest interpretation could perduellio be made to cover the murder of a sister.[1465] The second case is that of M. Manlius, 384, according to the more credible account,[1466] whereas Livy[1467] himself is of the opinion that the prosecutors were the plebeian tribunes. We may conclude, then, that the duumviri were still employed at this date.[1468] The third case is an unsuccessful attempt in 63 to revive the office for the trial of C. Rabirius.[1469] The first republican law of appeal must have empowered the comitia to order the appointment of these officials by the magistrate;[1470] and it seems probable that at a later date unknown to us they began to be elected by the people.[1471] The function of the duumviri was to try the case and pronounce sentence, from which if condemnatory the accused had a right to appeal to the comitia centuriata.[1472] From the analogy offered by the questorian procedure we may infer that the duumviri requested from a higher magistrate permission to take auspices for that assembly, over which they presided in the final trial.[1473]