How did the Roman government change over time ?

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Explanation:

The highest positions in the government were held by two consuls, or leaders, who ruled the Roman Republic. A senate composed of patricians elected these consuls. ... Over time, the plebeians elected their own representatives, called tribunes, who gained the power to veto measures passed by the senate.

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

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in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate