Rome

Patrician - a upper class person, powerful
Plebeian - common people, workers, farmers
Senate - a group of 300 patricians
Consuls - Two people, they have veto power over each other
Tribunes - leader of the plebeians assembly
Twelve Tables - the laws of Rome posted were everyone could see them on a Forum
Most important modern document, The United States Constitution, Senate / Assemblies / - US Senate / House Reps Consuls / Dictator - President of the US
Senate could act like judges - like our Supreme Court
Why could the rich only serve in the Senate ?
Members not paid, but worked their way up from low ranking magistrates to higher ones. They needed to spend a lot to look good, popular, and powerful, making them electable. Plebes couldn't afford to do that.
The kings who ruled between 600 and 500 BC ordered the building of the Forum, Rome's political center.