Why did a group known as theologians arise during the Roman Empire rather than the Roman Republic? They wrote about Christianity which had not yet developed during the Roman Republic.
They wrote about Roman conquests that happened after the Roman Republic declined.
They wrote about the tetrarchy form of government that was used during the Roman Empire.
They wrote about the development of Stoicism during the Roman Empire.

could you use this to with a topic?

the key difference between a democracy and a republic lies in the limits placed on government by the law, which has implications for minority rights. both forms of government tend to use a representational system — i.e., citizens vote to elect politicians to represent their interests and form the government.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.