十二表法
In 449 BC, the second decemvirate completed the last two codes, and after a "secessio plebis" (secession of the plebes, a plebian protest) to force the Senate to consider them, the Law of the Twelve Tables was formally promulgated. According to Livy (AUC ) the Twelve Tables were inscribed on bronze (Pomponius (Dig. 1 tit. 2 s2 §4) alone says on ivory), and posted publicly, so all Romans could read and know them.