Dionysius of Halicarnassus, Roman Antiquities 10.57
57 The next year62 the lawgivers took over the administration of affairs and established a form of government of the following general description. One of them had the rods and the other insignia of the consular power, assembled the senate, certified its decrees, and performed all the other functions belonging to the head of the state; while the others, by way of reducing the invidious character of their office to the more democratic level, differed in appearance but little from the mass of citizens. Then another of them in turn was vested with this authority, p357and thus it went on in rotation for a year, each one in succession receiving the command for a certain number of days as agreed upon. 2 But all of them sat from early morning arbitrating cases involving private and public contracts in which complaints might arise between citizens and the subjects and allies of the Romans and peoples of doubtful allegiance to Rome, examining each case with complete fairness and justice. 3 That year the Roman commonwealth seemed to be exceedingly well governed by the decemvirs. Above all they were commended for their care of the plebeians and for opposing, in defence of the weaker parties, every kind of violence; and it was said by many that the commonwealth would have no further need of champions of the populace or any of the other magistracies so long as a single wise leadership was directing all the affairs of the state. Of this régime Appius was looked upon as the head, 4 and all the praise that belonged to the whole decemvirate was given by the populace to him. For he gained a reputation for probity not only by those things which he did in concert with his colleagues from the best motives, but much more by the manner in which he conducted himself personally, as in the matter of greetings, friendly conversation and other kindly courtesies toward the poor.
הטענה ששני הלוחות האחורנים (מתריסר הלוחות) פורסמו על ידי קונסולים של שנת 449 BC, ואלריוס והורטיוס.