Opera publica

Opera publica is the Latin name used by Ancient Rome for the building of public works, construction or engineering projects carried out under the direction of the state on behalf of the community, and the buildings themselves. The term "public works" is a calque (literal word-by-word translation) of the Latin.

Public works in the Roman Empire were not merely buildings for conduct of the business of running the city, but all buildings for public use. Therefore, temples, basilicae, theatres, porticoes, fora, walls of towns, aqueducts, harbours, bridges, baths (both thermae and balneae), fountains, circuses, markets, cloacae, roads, etc. were classified as Opera Publica.

In the Late Roman Empire the citizens performed opera publica in lieu of paying taxes; often it consisted of road and bridge work. Roman landlords could also demand a number of days' labour from their tenants, and also from the freedmen; in the latter case the work was called opera officiales.

Public works were an important department, and the Roman censors were entrusted with the expenditure of this department's public money, though the actual payments were no doubt made by the quaestors. The censors had the general superintendence of all the public buildings and works and to meet the expenses connected with this part of their duties, the senate voted them a certain sum of money or certain revenues, to which they were restricted, but which they might at the same time employ according to their discretion. They had to see that the temples and all other public buildings were in a good state of repair, that no public places were encroached upon by the occupation of private persons, and that the aqueduct, roads, drains, etc. were properly attended to.

The repairs of the public works and the keeping of them in proper condition were let out by the censors by public auction to the lowest bidder, just as the vectigalia were let out to the highest bidder. These expenses were called ultrotributa, and hence we frequently find vectigalia and ultrotributa contrasted with one another. The persons who undertook the contract were called conductores, mancipes, redemptores, susceptores, etc.; and the duties they had to discharge were specified in the Leges Censoriae. The censors had also to superintend the expenses connected with the worship of the gods, even for instance the feeding of the sacred geese in the Capitol; these various tasks were also let out on contract.

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