Answer:
Like Athens, Rome was originally a city-state. Although it expanded rapidly by conquest and annexation far beyond its original borders to encompass all the Mediterranean world and much of western Europe, its government remained, in its basic features, that of a moderately large city-state. Indeed, throughout the republican era (until roughly the end of the first century BC), Roman assemblies were held in the very small Forum at the centre of the city.
Who constituted the Roman dēmos? Although Roman citizenship was conferred by birth, it was also granted by naturalization and by manumission of slaves. As the Roman Republic expanded, it conferred citizenship in varying degrees to many of those within its enlarged boundaries. Because Roman assemblies continued to meet in the Forum, however, most citizens who did not live in or near the city itself were unable to participate and were thus effectively excluded from the dēmos. Despite their reputation for practicality and creativity, and notwithstanding many changes in the structure of Roman government over the course of centuries, the Romans never solved this problem. Two millennia later, the solution—electing representatives to a Roman legislature—would seem obvious (see below A democratic dilemma).
As they adapted to the special features of their society, including its rapidly increasing size, the Romans created a political structure so complex and idiosyncratic that later democratic leaders chose not to emulate it. The Romans used not only an extremely powerful Senate but also four assemblies, each called comitia (“assembly”) or concilium (“council”). The Comitia Curiata was composed of 30 curiae, or local groups, drawn from three ancient tribus, or tribes; the Comitia Centuriata consisted of 193 centuries, or military units; the Concilium Plebis was drawn from the ranks of the plebes, or plebeians (common people); and the Comitia Tributa, like the Athenian Assembly, was open to all citizens. In all the assemblies, votes were counted by units (centuries or tribes) rather than by individuals; thus, insofar as a majority prevailed in voting, it would have been a majority of units, not of citizens.
Although they collectively represented all Roman citizens, the assemblies were not sovereign. Throughout the entire period of the republic, the Senate—an institution inherited from the earlier era of the Roman monarchy—continued to exercise great power. Senators were chosen indirectly by the Comitia Centuriata; during the monarchy, they were drawn exclusively from the privileged patrician class, though later, during the republic, members of certain plebeian families were also admitted.
The Italian republics from the 12th century to the Renaissance
“Constitutional oligarchies”
After the western Roman Empire collapsed in 476, the Italian Peninsula broke up into a congeries of smaller political entities. About six centuries later, in northern Italy, some of these entities developed into more or less independent city-states and inaugurated systems of government based on wider—though not fully popular—participation and on the election of leaders for limited periods of time. In this respect, their governments may be viewed as small-scale precursors of later representative systems. Such governments flourished for two centuries or more in a number of cities, including Venice, Florence, Siena, and Pisa.
Drawing on Latin rather than Greek, the Italians called their city-states republics, not democracies. Although membership in the dēmos was at first restricted mainly to the nobility and large landowners, in some republics in the first half of the 13th century groups from lower social and economic classes—such as the newly rich, small merchants and bankers, skilled craftsmen organized in guilds, and foot soldiers commanded by knights—began to demand the right to participate in government at some level. Because they were more numerous than the upper classes and because they threatened (and sometimes carried out) violent uprisings, some of these groups were successful. Even with these additions, however, the dēmos in the republics remained only a tiny fraction of the total population, ranging from 12 percent in 14th-century Bologna to 2 percent or less in 15th- and 16th-century Venice, where admission to the ruling nobility had been permanently closed during the 14th century. Thus, whether judged by the standards of Classical Greece or those of Europe and the United States in the 18th century and later, the Italian republics were not democracies. A more accurate characterization, proposed by the historian Lauro Martines, is “constitutional oligarchies.”