Cura annonae

In Imperial Rome, Cura Annonae ("care of Annona") was the logistics system which procured and distributed grain for the cities of Rome and, after its foundation, Constantinople. The term was used in honour of the goddess Annona. 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 Annona.