What was the structure and what were the main principles of ancient greece and ancient rome civilization's government?

Ancient Greece:

Structure:
The city-state was the basic unit of government in Ancient Greece. The most famous city-states were Athens, Sparta, Corinth, and Thebes. Each city-state had its own government and laws, but they all shared a common culture and language. The government of Ancient Greece was a democracy where citizens had a say in government decisions.

Principles:
1. Direct Democracy: Citizens had the right to participate directly in the government and vote on important issues.
2. Rule of Law: All citizens were equal before the law, and no one was above the law.
3. Citizenship: Only free adult men who were born in Greece or whose parents were Greek citizens could become citizens and take part in government.
4. Limited Government: There were limits on the power of the government, and citizens had the right to overthrow a tyrant if necessary.

Ancient Rome:
Structure:
Ancient Rome was a republic where the citizens elected officials to represent them in government. The most important officials were two consuls who were elected annually and had equal power. There were also a Senate and an Assembly of Tribes who made laws and served as a check on the power of the consuls.

Principles:
1. Separation of Powers: The government was divided into three branches: the executive branch (consuls), the legislative branch (Senate and Assembly of Tribes), and the judicial branch.
2. Representative Democracy: The citizens elected officials to make decisions on their behalf.
3. Rule of Law: All citizens were equal before the law, and no one was above the law.
4. Citizenship: All free adult men who were born in Rome or whose parents were Roman citizens could become citizens and take part in government. Women and non-citizens had fewer rights.