What was most important about the twelve tables?

The Twelve Tables (aka Law of the Twelve Tables) was a set of laws inscribed on 12 bronze tablets created in ancient Rome in 451 and 450 BCE. They were the beginning of a new approach to laws where they would be passed by government and written down so that all citizens might be treated equally before them.

that they established the idea of that all free citizens had a right to protection of all law and that they became thhe basis for all of the roman law