It really depends on which era, if the question asks about the Roman Republic, then it would be a republican government. In Ancient Rome, an aristocracy was used. In the Roman Empire, the emperor was the main man, but he also had a senate.
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Generally speaking, the "rule of law" refers to the constitution or implied constitution of a state or country that determines how all laws are made and enacted--something that no law of government action can go against.
Answer:
traditional ideology and code of conduct of knights