Rome Kept Its Senate and Lost Its Republic

Near the end of his life, Augustus put together an account of what he had done for Rome. He said that after bringing the civil wars to an end, he had returned the state to the Senate and the Roman people. A Roman looking around could still see a Senate in session and consuls taking office. Yet the man who said he had handed back power kept command of the provinces where much of Rome’s army was stationed. The Senate could still conduct public business, but it was in no position to take those armies away from him.¹

That gap between the power an institution appears to have and the power it can use is why Rome’s story matters to the United States. The Roman Senate and the U.S. Congress come from different political worlds, but both cases invite a practical question. When an official is told to stop, who can make the decision stick? In Rome, the answer changed well before the old titles disappeared.

How the Republic made leaders share power

Rome’s two consuls normally served for a year, the Senate carried influence across successive terms, and assemblies of citizens elected officials and voted on laws. Tribunes could block official actions. The Greek historian Polybius thought one of the Republic’s strengths was that each part of government needed the others. A consul might command an army, for instance, but its supplies and pay depended on decisions the Senate could make.²

This was a narrow system of participation. Women and enslaved people could not vote, and the assembly that elected consuls gave wealthy voters an advantage through the way it grouped citizens and counted their votes. Even among the men who could compete for office, however, one person’s authority ran into another’s. A colleague could object, an assembly could elect a rival, and a term could end. The arrangement worked as long as enough people with power were willing to accept those outcomes.³

As Rome conquered more of the Mediterranean, it became harder to keep military command within the rhythms of city politics. Campaigns could outlast a consul’s year in office, and a successful commander could come home with wealth, prestige, and soldiers who looked to him for rewards. Expansion gave Rome more territory to govern and its leading men more to gain from controlling the next campaign.⁴

When a decision stopped settling the dispute

In 133 BCE, the tribune Tiberius Gracchus proposed redistributing public land that wealthy Romans had long occupied. Another tribune, Marcus Octavius, vetoed the measure. Tiberius asked the assembly to remove Octavius from office, and once he was gone, the land bill passed. Later that year, a group led by Scipio Nasica killed Tiberius and many of his supporters. Plutarch, writing long afterward, depicts Nasica rallying the attackers in the name of defending the state.⁵

The people who wanted land had a grievance that a veto could leave unanswered. The veto was also a real protection, and removing the official who used it changed what that protection was worth. Nasica’s response raised the stakes further. Now a man could be killed by his political opponents for what he did in office. A government needs ways to bring a blocked proposal back for debate, and it needs ways to hold officials accountable through procedures their opponents cannot simply turn into punishment. Rome shows how hard it becomes to bargain when people doubt either of those routes will work.

In 88 BCE, an overseas war made the problem more dangerous. Rome had assigned Sulla to fight Mithridates, the king of Pontus, but a decision in Rome transferred the command to Marius. Sulla marched on the city with the troops under his command. In Appian’s account, the soldiers feared missing out on the profits of the campaign if Marius took a different army, so they had a reason of their own to back Sulla. Nearly all his senior officers, meanwhile, refused to march on Rome and left him. Sulla later returned from the east, won another civil war, and took a dictatorship that came with executions and confiscations.⁶

Mithridates was a serious enemy, but he did not have to conquer Rome for the Republic to suffer this blow. The foreign war put a valuable command at stake. The breach came when a Roman general used the troops entrusted to him to overturn a decision made in Rome. What mattered was whether those with the authority to reassign a command could actually get the army to follow their decision.

Why killing Caesar didn’t bring the Republic back

In 49 BCE, after a dispute over his command and the terms on which he would give it up, Julius Caesar crossed the Rubicon with troops. He won the civil war that followed, and in 44 BCE a group of conspirators killed him. They could end Caesar’s rule, but his death left the other armed rivals in place and gave them no settlement they would all accept. More fighting followed, and Caesar’s adopted heir Octavian eventually defeated Mark Antony and Cleopatra. In 27 BCE, the Senate gave him the name Augustus.⁷

The settlement Augustus built gave Rome a way out of repeated civil war. Senators still held offices and governed provinces, while Augustus retained the provinces that gave him command of much of the army. In his account of his rule, he also listed repairs to temples, roads, and aqueducts. After years of fighting, people had reasons to value an administration that could keep public works going and spare the city another contest between armies. Yet a settlement that depended on one man’s military supremacy gave Rome little practical means of replacing him against his wishes.⁸

Rome’s outward success had helped create this inward problem. Conquest supplied the armies, money, and offices that made Roman leaders formidable, then those leaders turned the resources of the state against one another. It took repeated decisions to get from a disputed veto to rule by an emperor, and at several points a different choice was still possible.

What a working check looks like in the United States

The U.S. Constitution gives the president command of the military, while giving Congress the authority to fund it and make rules for it. Those powers are divided for a practical reason. The official who directs the use of force should still have to answer to institutions that control what he can do with it. On paper, the division is easy to identify. The harder question is what happens when those institutions disagree about something the president considers urgent.⁹

There’s a concrete American example. In 1952, during the Korean War, President Harry Truman ordered the government to take over most of the country’s steel mills to avert a strike. The mill owners challenged the seizure, and the Supreme Court held that Truman lacked the authority to order it. Truman directed his administration to give up control of the mills, then asked Congress to act on the still unresolved strike. Truman still had a strike to deal with, but he could no longer deal with it by running the mills himself.¹⁰

That is the kind of outcome Americans can look for when assessing proposed changes to government. If Congress delegates an emergency power, it can set a date for that power to expire and require a fresh vote to extend it. If officials are to oversee spending, they need access to the records in time to do something about what they find. And if an officeholder loses an election, the people who carry out government decisions need a clear duty to the incoming officeholder. The U.S. Constitution fixes when a presidential term ends, which helps make the handover a matter of law instead of something the outgoing president has to agree to.¹¹

The Roman Senate’s survival helps explain why these details matter. Romans could still point to a room where senators gathered and to names on a list of consuls. The more revealing question was what those officials could do when Augustus wanted something different. It is the same question we should ask of our own institutions whenever someone proposes giving a leader more power.

Notes

1. Augustus, Res Gestae Divi Augusti, trans. P. A. Brunt and J. M. Moore (Oxford University Press, 1969), sec. 34; Cassius Dio, Roman History, trans. Earnest Cary, vol. 6 (Harvard University Press, 1917), 53.12–17.

2. Polybius, The Histories, trans. W. R. Paton, vol. 3 (Harvard University Press, 1923), 6.11–18.

3. Barbara F. McManus, “Roman Government,” VRoma, revised July 2003.

4. Department of Greek and Roman Art, “The Roman Republic,” Heilbrunn Timeline of Art History, Metropolitan Museum of Art, October 2000; Appian, The Civil Wars, trans. Horace White, vol. 3 of Appian’s Roman History (Harvard University Press, 1913), 1.55–57.

5. Plutarch, “Tiberius Gracchus,” in Lives, trans. Bernadotte Perrin, vol. 10 (Harvard University Press, 1921), secs. 8–13, 18–20.

6. Appian, Civil Wars 1.55–60, 1.95–104.

7. Appian, Civil Wars 2.30–36, 2.110–117; The Open University, “Rome: Republic to Empire,” sec. 1 in The Many Guises of the Emperor Augustus, OpenLearn, accessed November 2, 2026; Cassius Dio, Roman History 53.16.

8. Cassius Dio, Roman History 53.12–17; Augustus, Res Gestae, secs. 19–20.

9. U.S. Const. art. I, § 8, cls. 12–14; art. II, § 2, cl. 1.

10. Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579, 582–89 (1952); Harry S. Truman, “Special Message to the Congress on the Steel Strike,” June 10, 1952, Harry S. Truman Presidential Library and Museum.

11. U.S. Const. amend. XX, § 1.