Two halves of one empire, with the same institutions, the same law, the same enemies and the same religion, went in opposite directions within a single lifetime, and the difference is mostly a matter of which provinces each of them kept.
The previous lesson established that the peoples involved were few, familiar and mostly admitted rather than invading, and that nothing about them explains the outcome. This lesson supplies the mechanism. It is fiscal, it is visible in the laws the western government issued about itself, and it runs as a loop rather than a sequence.
The loop
State the empire's structure as three dependencies, all of them established in earlier lessons. The army exists to hold territory. The army is paid, fed and clothed out of taxes. The taxes come from territory.
That is a loop, and while it turns in the right direction it is extremely stable: a province held yields tax, which pays soldiers, who hold the province. Turn it the other way and it is just as stable. A province lost stops yielding tax, so fewer soldiers can be paid, so the next province is harder to hold. Nothing external is needed to keep it running once it starts, and the groups on the losing side of it do not have to be numerous or formidable. They only have to be there.
The western empire entered that loop in the first decades of the fifth century. Britain was let go around 410, with the emperor reportedly telling its cities to see to their own defence. Much of Spain and large parts of Gaul passed out of effective control in the following decades. And in 439 the Vandals took Carthage.
What Africa was worth
Africa was the richest tax territory the western government still controlled, exporting grain and oil on the scale the hill of broken amphorae in an earlier lesson recorded, and it had been untouched by war for centuries. Its loss is documented not by a historian's lament but by the western government's own legislation, which is far better evidence.
Example. In 445 a law of Valentinian III reduced the tax owed by Numidia and Mauretania Sitifensis to one eighth of the previous assessment, on account of the devastation. The year before, another law had stated that the treasury could not supply the army with food or clothing, and that what could be raised from the landholders was barely enough for the soldiers to subsist on. Read the two together.
The remission is the more informative document. Cutting an assessment to one eighth means writing off seven eighths of the revenue of provinces still nominally in Roman hands, which no government does for effect: it does it because the money is not there and pretending otherwise produces neither revenue nor compliance. So a treasury already short is now formally recognising the loss of the greater part of what remained in the region, in addition to everything the Vandals held outright.
The second law shows the consequence arriving on schedule. This is not a chronicler complaining about decline; it is the imperial government, in its own legislation, telling landowners that the army cannot be fed. Both halves of the loop are visible in the same archive within twelve months, and neither has anything to do with a battle.
Now you. The western empire still had Italy, and Italy contained some of the largest private fortunes in the ancient world. Why could the government not simply tax them harder?
Answer
Because by this point the great landowners were stronger than the machinery meant to assess them, and because the government needed them politically. Contemporary figures put the income of the greatest senatorial houses at around 4,000 pounds of gold a year, with more again in kind, which is an enormous private revenue standing beside a treasury that could not clothe its soldiers. Such men held estates across several provinces, staffed the civil administration, and could obstruct an assessment, obtain an exemption, or simply not pay, and the surviving laws are full of complaints about exactly this.
There is a deeper reason as well. An earlier lesson showed the empire taxing about five per cent of national income and having no elasticity at all, and the late Roman state had already used its emergency capacity in the third century. Raising more from a smaller territory means raising the rate on people who are already resisting, which produces evasion, flight from the land and the appeal of any local power that promises lower demands. Landowners in Gaul and Spain who made terms with a Gothic or Burgundian king often did better than under Roman assessment, which meant the loop had a political accelerator as well as a fiscal one: the state's response to losing revenue made the remaining provinces likelier to leave.
Generals who made emperors
As money became the binding constraint, the men who commanded what army remained became the government. From the 450s the western throne was in the gift of a single soldier, Ricimer, of Suevic and Gothic descent, who held the senior military command for sixteen years, raised at least four emperors and disposed of three of them, and never took the title himself because he could not: his ancestry barred it and he did not need it.
An earlier lesson identified the empire's founding weakness as the fact that the position of emperor was never an office and had no rule of succession. In the fifth-century west that weakness reached its logical end. The emperor was whoever the man with the troops named, the man with the troops was whoever the largest surviving field army followed, and the field armies were increasingly composed of allied contingents under their own leaders, on the model of the treaty of 382. The chain from tax to army to political control had not broken; it had simply been taken over at the point where the payments were made.
The last attempt, costed
In 468 the two halves combined for one enormous effort to retake Africa, funded overwhelmingly by the eastern government and commanded by Basiliscus. It reached Cape Bon, was destroyed by Vandal fireships, and achieved nothing.
Example. The sources give the cost as between 64,000 and 130,000 Roman pounds of gold. Convert it and set it beside two other figures from this course.
At 72 solidi to the Roman pound, 100,000 pounds is 7.2 million solidi, and at 327 grams to the pound it is 32.7 tonnes of gold. The lower figure gives about 21 tonnes and the higher about 43, so the honest statement is that the expedition cost somewhere between twenty and forty tonnes of gold.
Two comparisons make it legible. Trajan's Dacian windfall, on the emended figure this course used earlier, was about 164 tonnes, so this single failed expedition consumed something like a fifth of the greatest treasure Rome ever captured. And the annual tribute the eastern empire had been paying Attila a generation earlier, 2,100 pounds of gold, would have to be paid for close to fifty years to reach it.
The importance is what the failure implies. This was not a doomed venture: it was well funded, jointly mounted, and aimed at the one province whose recovery would have restarted the loop in the right direction, since Africa's revenue could have paid a western army again. When it failed there was no second attempt, because there was no second sum of that size. The west did not fall because of a battle; it ran out of the ability to try.
Now you. The eastern empire had paid Attila 2,100 pounds of gold a year and had been terrified of him. Set that against the senatorial income above. What does the comparison say about the east?
Answer
That the tribute was affordable and the fear was about something else. Twenty-one hundred pounds of gold a year is about 151,000 solidi, roughly half the annual income of one of the greatest Roman landed families. For a state whose army numbered in the hundreds of thousands, it is a small line in the accounts, and paying it was straightforwardly cheaper than fighting.
That is the eastern strategy in one figure. The east had cash, because it kept Egypt, Syria and Asia Minor, none of which was ravaged, and because Constantinople's revenues were collected in gold. With cash it could buy off what it did not want to fight, hire troops from the same peoples that threatened it, and wait for a confederation held together by one leader to fall apart when he died, which is what happened to the Huns. The west could not do any of this, not because its rulers were less clever but because they had nothing to pay with.
It is worth resisting the moral framing here, in either direction. Buying peace is not cowardice and it is not wisdom; it is an option that exists only for a government with money. The eastern empire had the option and used it, and the western empire, which by the 440s could not clothe its own soldiers, did not.
Why the east held
Three advantages, none of them a matter of virtue.
Geography. The east faced one land frontier that mattered, the lower Danube, plus Persia, which was a conventional state that could be negotiated with and was often distracted. Its capital sat behind the Theodosian walls and a strait, and could be supplied by sea; Constantinople was not taken by anyone until 1204. The west faced the Rhine, the upper Danube, the Alpine passes and, once the Vandals had a fleet, the whole Mediterranean coast.
Revenue. Egypt alone was a tax province of the first rank and remained in eastern hands until the seventh century. The east lost no significant territory during the period in which the west lost nearly everything, so its loop kept turning the right way, which is the entire argument of this lesson stated once more.
Structure. The eastern aristocracy was largely a service aristocracy, made by office in Constantinople and dependent on the emperor, rather than a class of vast independent landholders like the western senate. It was easier to tax and less able to obstruct, and no eastern general ever acquired the position Ricimer held in the west.
476
On 4 September 476 a commander of the Italian field army named Odoacer deposed the boy Romulus, mockingly called Augustulus, who had been installed by his father the previous year. Odoacer did not appoint a successor. He sent the western imperial regalia to the emperor Zeno in Constantinople, with the message that the west no longer needed an emperor of its own, and asked for the rank of patrician and authority to govern Italy.
Example. Explain why this date is both a reasonable end point and a poor description of an event.
Poor as an event, because almost nothing happened. There had been no effective western emperor for years; the legitimate one, Julius Nepos, was alive in Dalmatia and outlived the deposition by four years, and Zeno's reply pointed this out. Odoacer governed Italy with the Roman senate, the Roman civil administration, Roman law and the consulship still functioning, and dated documents by consuls in the usual way. No contemporary describes 476 as the end of the Roman empire, because from Constantinople's point of view the empire plainly still existed and had merely stopped having a second emperor, which had happened before.
Reasonable as an end point, because of the one thing Odoacer did not do: he did not put up a replacement. Every previous general in his position had needed an emperor as a source of legitimacy, and this one calculated that he did not, and was right. That marks the moment the western imperial office ceased to be worth maintaining even for the men who had been controlling it. Everything the office had been for, an army to command and revenues to distribute, was gone; and Odoacer had recognised that the useful thing to be was the man with the soldiers, with the title supplied from the east.
Now you. Historians increasingly avoid the word fall. Given this lesson, is that reasonable?
Answer
Half reasonable, and it is worth being precise about which half. What did not fall: the eastern empire, which continued without a break; the law, which the Germanic kingdoms adopted and reissued; the church, which kept its hierarchy, its language and its property; the Roman aristocracy of Italy and Gaul, many of whose families served the new kings; the cities, at least for a while. Anyone expecting a catastrophe in 476 will not find one, and the scholarship that emphasises continuity is right about all of this.
What did fall, and the word is not too strong, is a specific machine: a state that taxed a large territory in order to pay a professional standing army. That machine is what the last twelve lessons have been describing, and by 480 it did not exist in the west. Every other change follows from its absence rather than accompanying it, which is why the argument matters. The transformation school is describing the survivals accurately and can slide into implying that nothing important ended; the older account is right that something ended and tends to be wrong about what.
Naming the thing that ended is the task of the last lesson, and the test is material: if a tax-funded army really was the load-bearing structure, then its disappearance should show up in evidence that has nothing to do with politics. It does, in pottery, in buildings, in coins and in bones.
What is left to settle
The mechanism is now on the table. The west lost the provinces that paid for its army; an army that cannot be paid attaches itself to whoever can pay it; and the groups that could pay it became the governments of Spain, Africa, Gaul and Italy. The east kept its provinces and therefore kept its army and therefore kept its state.
That explains the political outcome and leaves the larger question open. An empire is not only a government, and the previous lessons measured a Roman world of long-distance trade, large cities, mass-produced goods and a shared material culture. Whether that world went down with the tax system, and how anyone can tell, is the subject of the final lesson.