Law as Rome’s Secret Weapon
Rome’s legions conquered territory, but law made it Roman. From the early Law of the Twelve Tables to Justinian’s great codification, Roman jurists hammered out principles that would echo through Europe until the seventeenth century and beyond.
They divided law into three broad realms:
- Jus civile: citizen law, governing Roman citizens’ rights and obligations.
- Jus gentium: the “law of nations”, handling interactions between citizens and foreigners.
- Jus naturale: natural law, thought to underlie all peoples and beings.
Special magistrates, praetores urbani and peregrini, presided over citizen and mixed cases, adapting rules as empire widened.
A Hierarchy Woven into Everyday Life
Roman society was a steep pyramid. At the bottom were slaves; above them, freedmen and freedwomen; and at the top, freeborn citizens. Even among citizens, status fractured further.
Patricians traced lineage to the original hundred patriarchs of Rome; plebeians did not. Over time, rich plebeians joined politics and some patricians declined, but ancestry still brought cachet—and exclusive religious offices.
Another, more potent division was wealth. Censors regularly assessed property, placing men into classes that determined military role and voting power. Senators, the richest, monopolised high office and army commands. Below them, equestrians formed a powerful business class, barred from commerce if they sat in the Senate, but vital to tax farming and contracts.
The poorest citizens, the proletarii, owned nothing but their children. Before military reforms they could not serve in legions; politically, they were lumped into a single, easily overridden voting tribe.
Who Belonged to Rome?
Citizenship was precious. It determined whose law applied, who could vote, and who could serve in office. Allies could be granted Latin Rights, an in‑between status that gave legal protections and, for some magistrates, a path to full citizenship.
Conquest forced Rome to rethink the boundaries of “Roman”. After the bloody Social War (91–88 BC), most Italian allies received full citizenship. Then, in 212 AD, Emperor Caracalla issued an edict making nearly all free men in the empire citizens—except certain surrendered peoples and freed slaves.
Women occupied an ambiguous space: they shared a restricted citizenship, could own property, run businesses, and appear in court, yet were excluded from voting and office. Over time, their property and legal rights expanded, even as formal politics stayed closed.
The Takeaway
Rome’s genius lay not only in conquering, but in gradually extending, reshaping, and using citizenship and law to bind diverse peoples. Its sharp hierarchies coexisted with a surprisingly elastic idea of who could, eventually, become Roman.