Why did plebeians seek a public written code of laws in ancient Rome?

In ancient Rome, plebeians sought a public, written code of laws—which resulted in the Law of the Twelve Tables—primarily to address the systemic inequality inherent in the Roman legal system.

At the time, legal judgments were based on unwritten customs that were known only to a small group of learned patricians. Because the law was not public, plebeians felt their legal rights were severely hampered, as they had no way to verify the rules or ensure consistent application of justice. By demanding that the laws be inscribed on bronze tablets and displayed in the Roman Forum, the plebeians aimed to:1

• Gain Transparency: Become acquainted with the laws that governed their lives.1
• Prevent Abuse: Protect themselves against the arbitrary exercise of power and potential corruption by patrician officials.12
• Limit Authority: Circumscribe the power of magistrates to ensure legal procedures were applied more predictably.2

While the Twelve Tables did not eliminate all social disparities, they established a foundational, systematic body of Roman law that served as a critical step in the plebeians' long struggle for legal and political equality.123