Tuyến thương mại
Roma nhập khẩu gần như toàn bộ lương thực. Các đoàn tàu chở lúa mì từ châu Phi, và sau năm 30 TCN là từ Ai Cập; chuyến đi chậm chạp từ Alexandria ghé qua Síp, Lycia, nam Crete và Sicilia rồi tới Puteoli hoặc Ostia, từ đó sà lan chở ngược sông Tiber. Một phần được phát miễn phí theo chế độ trợ cấp lương thực.
In Imperial Rome, cura annonae (lit. 'care of the grain') was the logistics system which procured and distributed grain for the cities of Rome and, after its foundation, Constantinople. The city of Rome imported all the grain consumed by its population, estimated to number 1,000,000 by the 2nd century AD. This included recipients of the grain dole or corn dole, a state-run social welfare program which gave out heavily subsidized and later free grain or bread to about 200,000 of Rome's adult male citizens.
Rome's grain subsidies were originally ad hoc emergency measures taken to import cheap grain from trading partners and allies at times of scarcity, to help feed growing numbers of indebted and dispossessed citizen-farmers. The programmes expanded over time, such that by the end of the Republican era, the grain dole was a permanent social welfare program which comprised a substantial part of the state budget. The grain dole was reluctantly adopted by Augustus and later emperors as a free monthly issue to those who qualified to receive it. In 22 AD, Augustus' successor Tiberius publicly acknowledged the cura annonae as a personal and imperial duty, which if neglected would cause "the utter ruin of the state".
During the Imperial Era, a regular and predictable supply of subsidised grain, the grain dole, and sumptuous public games such as gladiator contests and chariot racing earned the obedience of potentially restive lower-class urban citizens, providing what the poet Juvenal sarcastically summed up as "bread and circuses". Sufficient capacity to supply the Cura system required both adequate production in the provinces and the operation of massive numbers of ships, generally privately owned and hired by the government, to transport it to Rome. Most of Rome's grain supply was grown, imported, stored and traded as a profitable commodity, funded by speculators and hoarders, using loans, not state subsidies. Some provinces were almost entirely given over to the production of grain for consumption in Roman cities. The most important sources of bread grain, mostly durum wheat, were Roman Egypt, North Africa (21st century Libya, Tunisia, Algeria, and Morocco), and Sicily. When the Vandals took over most of these provinces (c. 439), the Western Roman Empire lost the greater part of its grain supply.
Some form of cura annonae may have persisted as late as the 6th century for Rome, but far less grain was shipped compared to earlier periods; in Constantinople, capital of the Eastern Roman Empire, it lasted as late as the 7th century, in reduced form. The population of the city of Rome declined precipitously during the last years of the Western Roman Empire. Until the introduction of the railway in the 19th century, no other city was able to organize the extensive logistics needed to sustain a program resembling the cura annonae.
The city of Rome grew rapidly in the centuries of the Roman Republic and Empire, reaching a population approaching 1,000,000 in the 2nd century AD. The wars of the early Republic led directly to the expansion of Roman territory, the acquisition of arable land, and land hunger for Rome's least powerful, impoverished citizens. Landholding was the material basis of male Roman citizenship, and land distribution remained a major issue throughout Rome's history. Most commoner-citizens were also farmers, either as small landowners or as tenants. They could be conscripted to serve in the military, with minimal recompense, on campaigns that could last for years. In peacetime, the same commoner-soldiers relied on whatever crops they could raise on their own land, weather permitting, with very little capacity to produce a surplus for trading.
Roman staples were grains, especially wheat; olives and olive oil, grapes and wine; and cheese. In a good year, and with favourable weather, a grain harvest could yield around ten times what had been sown. Farms within Rome's vicinity were used to raise equally essential but more perishable crops. Although farmland taken from conquered enemies was legally ager publicus (publicly owned farmland), most was swallowed up by the wealthy and powerful, who found that grapes and wine were more profitable commodities than grain.
In lean years, subsistence farmers might have no option other than borrowing from their patrons or landlords. Some of them accumulated levels of debt that proved impossible to pay off and were forced to sell their farms or surrender their tenancies and either work for the new owner or move to a city with their families and seek patronage there. According to Roman historical tradition, the Roman government intervened sporadically to obtain and distribute free or subsidized grain to Rome's more impoverished male citizens during shortages and famines. The terms of these early provisions are lost.
A version of an earlier Lex Licinia was proposed by Gaius Gracchus, and approved by the Roman popular assembly in 123 BC, in the face of extreme opposition from politically conservative landowners. Eventually, adult male Roman citizens (over approximately 14 years of age) with an income or property under a certain value were entitled to buy 33 kilograms (73 lb) grain per month at a below-market price of five modii. The qualifying income threshold is not known, but according to Caesar's municipal legislation of 44 BC, landlords of tenement blocks helped compile lists of persons who might qualify to receive grain; two aediles Cereales, civic-religious officials who served the grain goddess Ceres, patron goddess of the plebs, were made responsible for its distribution.
Initially, about 40,000 adult males were eligible. In 58 BC, Clodius gave an estimated 320,000 citizens free issue of grain. This was reduced to 150,000 by Julius Caesar and increased to 200,000 by Augustus Caesar, who disapproved of a permanent grain dole but took personal responsibility for the free supply, as did all emperors after him. The number of beneficiaries remained more or less stable until near the end of the Western Roman Empire. In the early Roman Empire, the requirements of the grain dole are thought to account for 15–33% of Rome's imported grain. A large part of the city's supply was obtained through the free market. Prices in the city were invariably higher than elsewhere, and merchants could count on making a profit. Some of the grain collected as tax in kind was distributed to officials and soldiers and some was sold at market rates.
In the 3rd century AD, the dole of grain was replaced by bread, probably during the reign of Septimius Severus (193–211 AD). Severus also began providing olive oil to residents of Rome, and later the Emperor Aurelian (270–275) ordered the distribution of wine and pork. From the late second century, under the rule of the Severan dynasty, food provision for Rome's military came under the rubric annonae militaris, a form of requisition that might be met through coin or payment in kind, preferably as trade surpluses but otherwise "siphoned off more or less forcefully" from local civilian economies; the needs of the military had always been prioritised over the needs of civilians. The doles of bread, olive oil, wine, and pork apparently continued until near the end of the Western Roman Empire in 476 AD, although the decline in the population of the city of Rome reduced the overall quantities required.
A regular grain supply for Rome depended on good harvests elsewhere, an efficient system of transport, storage and distribution, and honest investors willing to underwrite the risks in return for a share. The Prefect of the Imperial annona had an office and grain stores in Ostia, Portus, purpose-built by Claudius and enlarged by Trajan, and almost certainly the same facilities in the ports of supply, such as Alexandria. The trading mechanisms employed were already in place during the Republican era, when agents, merchants and wealthy freedmen negotiated with members of Rome's senatorial and equestrian classes to fund grain imports, and find favour with the Roman masses.
The risks were high but so were the rewards. As a slightly lesser but highly capable form of Roman nobility, the equestrian class were free to openly carry on whatever respectable business they chose; senators, as major landowners, were supposedly indifferent to personal profit or loss, but were the main source of investment. The elder Cato, senator and consul, seems to have been typical in using his most capable freedmen as agents, factors and merchants. In a fleet of 50 grain transports, he underwrote the purchase and cost of a single ship and its grain complement. Any profit, or loss, was shared by all fifty investors.
The economies of some provinces were almost entirely dependent on grain exports, paying tribute or taxes in kind, rather than coin. Rome had a particular interest in the social and political stability of such provinces, and their protection. By the late 200s BC, grain was being shipped to the city of Rome from the provinces of Sicily and Sardinia. In the second century BC, Gaius Gracchus settled 6,000 colonists to exploit the fertile lands of newly conquered Carthage, giving each about 25 hectares (62 acres) to grow grain. Carthage thus became a major contributor to the annona.
In the first century BC, the three major sources of Roman wheat were Sardinia, Sicily, and the north African region, centered on the ancient city of Carthage, in present-day Tunisia. Sailing time one-way from Sicily to Rome's port of Ostia Antica was about four days. From Carthage sailing time was about nine days. With the incorporation of Egypt into the Roman Empire and the direct rule of the Emperor Augustus (27 BC – 14 AD), Egypt became Rome's main source of grain. By the 70s, the historian Josephus was claiming that Africa fed Rome for eight months of the year and Egypt only four. Although that statement may ignore grain from Sicily, and overestimate the importance of Africa, there is little doubt among historians that Africa and Egypt were the most important sources of grain for Rome.
Bread was by far the most important single commodity in the Roman diet. Rickman estimates that Rome needed 40 million modii (272,000 tonnes) of grain per year to feed its population. Erdkamp estimates a minimum annual requirement of 150,000 tonnes, assuming an annual consumption of 200 kilograms (440 lb) per capita by a total population estimated at 750,000 to 1,000,000. Mattingly and Aldrete estimate the imported grain at 237,000 tonnes for 1,000,000 inhabitants, providing 2,326 calories daily per person from grain alone.
The recipients of the grain dole were a small, low status but privileged group of citizens, the plebs frumentaria. Their 5 modii monthly allowance was "ample for two people but well below the minimum subsistence allowance for three". Those not qualifying for the dole, or those who had to supplement their dole to feed themselves and their families were forced to buy grain at inflated prices, find patronage, go into debt or go without. Augustus doubled the allowance for some of those already entitled, but this seems to have been an exceptional, ad hoc solution. The precise details of how grain was marketed in Rome are a "major puzzle".
The shipping lanes that connected Rome with its centers of grain supply had strategic importance. Whoever controlled the grain supply had a measure of control over the city of Rome, which depended on timely arrivals of imported grain, outsourced to civilian merchants and their fleets. In most years, Rome's state grain stores were severely depleted by the end of winter. There were obvious advantages in stockpiling several years worth of harvest to create very large grain surpluses and keep prices low; the Historia Augusta, claims that Severus left "7 years worth of grain tribute" to the Roman people. The same strategy was used to very different effect by civilian corn-factors who hoarded grain to simulate shortages and raise grain prices on the open market.
The provision of grain to Rome was a major shipping and administrative task. It was "cheaper to ship grain from one end of the Mediterranean to the other" than "to cart it by land some 75 miles [120 kilometers]." Kesler and Temin calculate that Rome's grain supply in the early Empire required a total of 2,000 to 3,000 merchant voyages annually, with each vessel carrying an average of 70,000 kg, sometimes much more.
Sailing times from the ports of Ostia (near Rome) and Puteoli (near Naples) to Alexandria in Egypt might be as brief as 14 days, with the wind behind. Like almost all non-military ships, large grain transports were propelled by sail, not oars. Returning to Rome would take much longer as the winds were adverse and ships had to tack a course, hugging coastlines when possible. "The voyage...from Alexandria to Rome was a continuous fight against foul winds." Lionel Casson estimated that average time for the voyage was nearly 70 days.
Casson estimates that the outward-bound freighters "raced down from Ostia or Puteoli to Alexandria with the wind on their heels in ten days to two weeks" and the voyage back laden with grain "...took at least a month and on occasion two or more." Given the time needed for loading and unloading, the larger grain ships traversing the Egypt to Rome route likely only completed one round trip per year. Several round trips per year could be accomplished from North Africa or Sicily.
The harvest season for grain in ancient Egypt was from April to early June. The annual Nile flood began in June and thus harvest had to be finished before the river's waters covered the land. The grain in Egypt was apparently acquired by Rome as a tax on farmers. The grain was moved mostly by barge on the various distributaries of the Nile River to Lake Mareotis bordering the southern part of the city of Alexandria. There it was inspected for quality and, when accepted, transported by canal to the port of Alexandria, the Great Harbor, where it was loaded onto ships for Rome.
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