After years of plebeian pressure against patrician arbitrariness in applying unwritten customary law, Rome appoints a commission of ten men (decemvirs) to draft a code of laws valid for all citizens. They publish ten tables in 450 BC; a second commission adds two more the following year. The set is inscribed on bronze and displayed in the Roman Forum so any citizen can read it. The original tables were lost (traditionally in the Gallic sack of Rome, 390 BC) and are known through fragments and citations in later works, especially Justinian's Digest. Cicero considered them superior in authority to the libraries of all the philosophers.