Why did the rule of law originate in Rome?

Law as a state mechanism for the life of citizens originated in ancient Rome, back in the era of the tsarist period. The first ruler and founder of Rome, King Romulus, made the first attempts to bring the way of life of citizens to a single standard, which was controlled by law and the elected government, to create a strong and reliable state. He consolidated the institution of citizenship, which gave the citizens of Rome certain privileges at the legal level. Established a complex system of government that ended with a Senate. We can say that from this moment the formation of Roman law began, which, in a changed format, is still in effect.