In Ancient Rome, there were two "types" of people. Plebeians, who were peasants, artisans, craftspeople, or more. Also, there were Patricians, who were nobles, saw to be the descendants of the founders of Rome.
After the rebellion of the plebeians, the patricians feared that Rome would fall apart, so they allowed plebeians to take part in meetings at the Forum, and had almost the same rights as the patricians. As well as that, they created a system called checks and balances. It was a government that had three branches.
The first branch is two magistrates, who are judges that are the judges for a short time.
After a few years, the Roman empire began to fall out of hand. People was starting to gain to much power, and the Roman empire was starting to turn into an empire. Retired magistrates were trying to fix that by making the 12 Tables, which is a new law code. These laws were displayed in the assembly.
The second is two consuls that govern for a year, and have to agree on laws.
The third branch was plebeians that can veto laws that are unfair, that are called tribunes.