Roman Empire, the so-called barbarians who were initially dominated and incorporated into Roman armies or used as slaves now dominated many parts of the empire. As a young man, Aetius had been held hostage by barbarians, first by the Goths under Alaric and then by the Huns. Roman relations with these barbarians are indicative of how things had changed since the Republic. Alaric was both a ferocious enemy and an ally, so much so that in 405 he was appointed one of the senior-most generals of the Roman army. The arrangement was temporary, however. By 408, Alaric was fighting against the Romans, invading Italy and sacking Rome.
The Huns were also both powerful foes and frequent allies of the Romans. Though they, too, held Aetius hostage, they later fought alongside him in a civil war. But the Huns did not stay long on one side, and under Attila they fought a major battle against the Romans in 451, just across the Rhine. This time defending the Romans were the Goths, under Theodoric.
All of this did not stop Roman elites from trying to appease barbarian commanders, often not to protect Roman territories but to gain the upper hand in internal power struggles. For example, the Vandals, under their king, Geiseric, ravaged large parts of the Iberian Peninsula and then conquered the Roman bread baskets in North Africa from 429 onward. The Roman response to this was to offer Geiseric the emperor Valentinian III’s child daughter as a bride. Geiseric was at the time married to the daughter of one of the leaders of the Goths, but this does not seem to have stopped him. He annulled his marriage under the pretext that his wife was trying to murder him and sent her back to her family after mutilating her by cutting off both her ears and her nose. Fortunately for the bride-to-be, because of her young age she was kept in Italy and never consummated her marriage to Geiseric. Later she would marry another powerful general, Petronius Maximus, the mastermind of the murder of Aetius by the emperor Valentinian III, who would himself shortly be murdered in a plot hatched by Maximus. Maximus later declared himself emperor, but his reign would be very short, ended by his death during the major offensive by the Vandals under Geiseric against Italy, which saw Rome fall and savagely plundered.
BY THE EARLY fifth century, the barbarians were literally at the gate. Some historians argue that it was a consequence of the more formidable opponents the Romans faced during the late Empire. But the success of the Goths, Huns, and Vandals against Rome was a symptom, not the cause, of Rome’s decline. During the Republic, Rome had dealt with much more organized and threatening opponents, such as the Carthaginians. The decline of Rome had causes very similar to those of the Maya city-states. Rome’s increasingly extractive political and economic institutions generated its demise because they caused infighting and civil war.
The origins of the decline go back at least to Augustus’s seizure of power, which set in motion changes that made political institutions much more extractive. These included changes in the structure of the army, which made secession impossible, thus removing a crucial element that ensured political representation for common Romans. The emperor Tiberius, who followed Augustus in AD 14, abolished the Plebeian Assembly and transferred its powers to the Senate. Instead of a political voice, Roman citizens now had free handouts of wheat and, subsequently, olive oil, wine, and pork, and were kept entertained by circuses and gladiatorial contests. With Augustus’s reforms, emperors began to rely not so much on the army made up of citizen-soldiers, but on the Praetorian Guard, the elite group of professional soldiers created by Augustus. The Guard itself would soon become an important independent broker of who would become emperor, often through not peaceful means but civil wars and intrigue. Augustus also strengthened the aristocracy against common Roman citizens, and the growing inequality that had underpinned the conflict between Tiberius Gracchus and the aristocrats continued, perhaps even strengthened.
The accumulation of power at the center made the property rights of common Romans less secure. State lands also expanded with the empire as a consequence of confiscation, and grew to as much as half of the land in many parts of the empire. Property rights became particularly unstable because of the concentration of power in the hands of the emperor and his entourage. In a pattern not too different from what happened in the