Rome's first written laws came from commoners demanding fair judges
Early Roman magistrates applied unwritten custom however they liked. A plebeian tribune pushed to get the rules written down, and after eight years of struggle Rome produced the Twelve Tables around 449 BC. The originals probably burned when the Gauls sacked the city, yet their legal tradition shaped courts across Europe for two millennia.
Before the tables, private law covered only citizens, was tied up with religion and relied on rigid rituals, possibly inherited from Etruscan practice. The jurist Sextus Pomponius described the city's earliest days as run by kings with no fixed rights at all. Tradition says a board of ten men was chosen in 451 BC to draft the laws and handed supreme power while doing it; their ten tablets disappointed the plebeians, and a second board supposedly added two more. Modern historians doubt that second board existed, and many think Greek ideas arrived through the Greek cities of southern Italy rather than an embassy to Athens.
Surviving fragments show the tables were not a complete code but targeted fixes to custom, mostly about private disputes and court procedure. Later statutes chipped away at class barriers: the Lex Canuleia of 445 BC let patricians and plebeians marry, a law of 367 BC reserved one consulship for a plebeian, and the Lex Hortensia of 287 BC made plebeian assembly decisions binding on everyone. The Lex Aquilia of 286 BC is often seen as the seed of modern tort law.
Rome's bigger gift was a profession. Around 300 BC Gnaeus Flavius reportedly published the formulas needed to start a lawsuit, which only priests had known, opening legal study to outsiders. Jurists such as Quintus Mucius Scaevola wrote huge treatises, applying Greek philosophical method to a subject the Greeks never treated scientifically. Praetors issued yearly edicts that kept the useful rules of their predecessors, so law evolved through practice rather than legislation.
The tradition culminated in Justinian's Corpus Juris Civilis of AD 529 and lived on in Greek in the Byzantine east. It governed most of Western Europe until the late 18th century, persisted in German lands under the Holy Roman Empire until 1806, and spread to Latin America and Ethiopia. Even English common law absorbed its Latin vocabulary.
Source: Roman law
