Where are the origins and structure of the Greek polis, the Roman Republic, and the Roman Empire?

The Greek polis was a city-state,

They varied in form of government:

monarchies, aristocracies, oligarchies,

democracies, and military states

City-States were usually easy to control, but

had many rivals to contend with

The Roman Republic (509 B.C.-44 B.C.)

The Roman Republic was Built on the Tiber River near the Mediterranean Sea

Formed a republic with 2 main ruling groups: the  patricians and the plebeians (509 B.C.)

Established written laws (12 Tables)

Had 2 consuls (king like rulers) and a senate

The Army played a large role in the Republic

All adult male landowners were given citizenship

The Roman Empire (44 B.C.- A.D. 476)

The Republic began to fail due to

economic strains between the

classes

After years of civil war, Julius

Caesar, a military leader, gained

control

Rome was controlled by an

emperor and a senate limited in

power, and established a civil

service

Explanation:

byzantine empire is the answer i think you are looking for.

hope this : )