Italian States: Political Power from Late Antiquity to the Early Modern Era

From the end of Roman imperial rule in the West to the seventeenth century, the Italian peninsula was governed by a changing collection of kingdoms, duchies, republics, and territories ruled by the papacy. Its political boundaries rarely matched those of modern Italy. Power also varied by region: northern and central cities developed forms of self-government, while southern territories were often brought together under kingdoms. The result was not a single political system, but a shifting balance among local institutions, religious authorities, dynasties, and outside powers.

Roman cities and roads provided an important setting for later political life, but the medieval states were not simply continuations of Roman government. After the Western Roman Empire ended in the fifth century, control of the peninsula passed among different rulers. From the eleventh century onward, urban growth and trade helped many cities increase their autonomy. In later centuries, larger regional states and foreign dynasties altered the balance again.

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After the Western Empire: Lombard and Byzantine territories

After the western emperor Romulus Augustulus was deposed in 476, Odoacer ruled Italy. The Ostrogothic king Theoderic defeated him and took power in 493. The Eastern Roman, or Byzantine, reconquest of the sixth century then devastated much of the peninsula. Lombard invasion from 568 produced another division: a northern kingdom and southern duchies developed beside territories still governed from Constantinople.

This division shaped the political geography of the peninsula for centuries. Lombard rulers governed a kingdom and a number of duchies, including Spoleto and Benevento. Other southern towns and territories retained distinct political arrangements, sometimes under Byzantine authority in name while acting with considerable independence in practice. In 751 the Lombards captured Ravenna, ending the Byzantine exarchate based there. Under pressure from further Lombard expansion, the papacy sought Frankish military support. In 756, Frankish forces defeated the Lombards and granted the papacy authority over much of central Italy.

The Lombard kingdom and duchies

From Pavia, Lombard kings sought to direct dukes whose military forces and regional bases made them powerful partners and rivals. Royal officers managed estates and heard cases, while laws issued in Latin addressed Lombard customs within a society that also contained Roman institutions and populations. Spoleto and Benevento’s distance from the capital helped preserve their autonomy.

Papal and imperial power in the peninsula

The papacy exercised two kinds of authority: religious leadership over the Western Church and, increasingly, secular rule over territory. The Frankish grant of 756 established the basis of the Papal States, a group of lands in central Italy governed in the pope’s name. Their borders and the strength of papal administration changed over time. The papacy was both a territorial power and a participant in wider contests over authority.

From 800, when Charlemagne was crowned emperor, the rulers who claimed imperial authority became another force in Italian politics. In northern Italy, emperors sought influence over cities and their territories. A major dispute between the papacy and the empire concerned the appointment of church officials, especially bishops. The Concordat of Worms in 1122 addressed this conflict, though it did not end political competition in every region.

These overlapping claims created opportunities for local rulers and city governments to negotiate, resist, or form alliances. During the twelfth century, northern communes united in the Lombard League against Emperor Frederick Barbarossa. The league defeated him at Legnano in 1176. Such contests did not remove imperial claims from Italy, but they helped establish the practical autonomy of some northern cities. The Papal States, meanwhile, remained a substantial territorial power in central Italy.

Communes and the growth of urban government

From the eleventh century, many northern and central Italian towns developed into communes, meaning self-governing urban communities with their own civic institutions. Venice, Milan, Florence, Genoa, Pisa, Lucca, and Siena were among the cities that gained greater independence from their formal rulers. Their success rested in part on growing trade and population, but their political arrangements differed from city to city.

Councils and magistrates managed civic affairs, with leading families, merchants and organised trades competing for office. The names Guelph and Ghibelline broadly associated factions with papal and imperial causes, but local family interests and territorial disputes often determined alliances. Rival communes also fought over farmland, roads, tolls and access to markets.

Trade supplied taxable wealth and credit for government, diplomacy and warfare. Merchants needed arithmetic to convert currencies, calculate shares and assess transactions. Leonardo Fibonacci’s Liber Abaci, first written in 1202 and revised in 1228, explained Hindu-Arabic numerals and practical calculations. Such tools supported commerce conducted across different monetary and measurement systems.

Maritime republics and Mediterranean connections

Some Italian cities built their power around shipping and overseas trade. Amalfi, Gaeta, and Venice had become autonomous maritime republics by the eleventh century; Genoa, Pisa, and Ancona also emerged as independent maritime powers around the beginning of the twelfth. Their ships served trade and defense, while shipbuilding and banking helped support their fleets.

Venice and Genoa developed extensive commercial connections across the Mediterranean and into the Black Sea. Their merchants traded with Byzantine and Muslim societies as well as with western Europe. These networks brought goods, information, and wealth into Italian cities, and helped make the maritime republics influential participants in crusading and regional politics. Venice’s role in the Fourth Crusade, which led to the capture of Constantinople in 1204, shows how commercial and military aims could intersect.

Maritime republics were not all alike, nor were they isolated from the mainland. Their wealth and influence depended on shipping routes, political agreements, and control of ports and territories. Venice in particular expanded beyond its lagoon into a regional power. Genoa and Pisa, meanwhile, competed with one another as well as with Venice for maritime influence.

Lordships and the formation of regional states

By around 1300, many cities that had once been governed as communes were under the authority of a signore, or lord. In some cases, a lord’s family established a lasting dynasty and extended its rule to nearby cities. The Republics of Venice, Florence, and Genoa, along with Lucca and a few others, maintained republican government, though their institutions and political life also changed over time.

Some rulers sought formal recognition of their authority from a superior power. In 1395, Gian Galeazzo Visconti acquired the title of Duke of Milan from King Wenceslaus. At the same time, Milan, Venice, and Florence expanded by conquering or absorbing other cities. These developments shifted political power from numerous smaller communes toward larger regional states.

The Peace of Lodi in 1454 helped establish a balance among the leading powers of Milan, Venice, and Florence after a period of rivalry. It did not unify Italy or end competition across the peninsula. Instead, several powerful states continued to coexist with smaller republics, duchies, and the Papal States.

Regional kingdoms in southern Italy

Southern Italy followed a different political course from much of the north. Lombard and Byzantine territories existed alongside independent or semi-independent duchies and cities. From the eleventh century, Norman rulers conquered Lombard and Byzantine possessions. In 1130 Roger II became the first king of the Norman Kingdom of Sicily, bringing Norman conquests in southern Italy together under a comparatively centralized monarchy.

That kingdom did not remain under one dynasty. In 1194 Sicily passed to the Hohenstaufen, or Swabian, dynasty. Later, Angevin and Aragonese rulers held power in the south, and parts of the region came under French and Spanish crowns. The names and boundaries of southern kingdoms changed with these successions. Their histories show why it is misleading to treat the south as one unchanging political unit.

Foreign intervention and early modern Italy

The relative balance among regional powers was unsettled by the French invasion of 1494, which began the Italian Wars. France and the Habsburg powers competed for territory, drawing many Italian states into a prolonged struggle. The wars ended in 1559 with France renouncing its claims in Italy. Spanish Habsburg rulers held Milan, Naples, and Sicily, while other states, including the papal territories and the Republic of Venice, retained their own governments.

Political independence therefore varied widely. Some states remained republics or duchies, while others were governed by dynasties with connections to powers beyond the peninsula. The commercial position of Italian cities also changed. Atlantic routes and expanding trade elsewhere reduced the relative importance of Mediterranean commerce, and Spanish involvement in prolonged European wars placed financial pressures on its Italian possessions. These changes did not erase Italy’s many local governments, but they altered the resources and influence available to them.

The peninsula remained divided into distinct states into the nineteenth century. Most were brought together in the Kingdom of Italy in 1861, while Rome became part of the kingdom in 1870. Unification replaced these separate governments with a new national political framework.

For the wider setting, see Italian History: States, Cities, and Mediterranean Connections from Late Antiquity to the Seventeenth Century.