The Romans' first code of law was established around 450 B.C. on the Twelve Tablets. The Twelve Tablets were of bronze material and they contained the rights and duties of the ancient Roman citizen. They were written by 10 commissioners called "Decemvirs" due to public pressure, especially of the plebeians (ordinary people), that demanded laws that better represented their interests and protect them from the abuse of powers from aristocrats and priests.