What set of written laws was Rome’s first, and applied to both the rich and the poor?

All Roman law was formally based on the Law of the Twelve Tables.
The Law of Twelve Tables was a rather primitive collection.
Nevertheless, it contained a large number of regulations that formed the basis of the entire Roman legal system.
This law has never been amended, nor has any regulations been deleted, but it has been formally valid throughout Roman history.
This, of course, does not mean that the law was perfect. Far from it, but the enterprising Romans simply went over some outdated regulations or adapted them to a changed reality.
Since they were of great tradition, they never took the courage to abolish or change it. They regarded it as divine law, taught it by heart in schools, and regarded it as the primary source of all law.

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