Following a short recapture of the Italian peninsula by Byzantine Emperor Justinian in the 6th century AD from the Ostrogoths, a new wave of Germanic tribes, the Lombards, soon arrived in Italy from the north. For several centuries the armies of the Byzantines were strong enough to prevent Arabs, the Holy Roman Empire, or the Papacy from establishing a unified Italian Kingdom, but were at the same time too weak to fully unify the former Roman lands themselves. Nevertheless, during early Middle Ages Imperial dynasties such as the Carolingians, the Ottonians and the Hohenstaufens managed to impose their overlordship in Italy.
Italy's regions were eventually subsumed by their neighbouring empires with their conflicting interests and would remain divided up to the 19th century. It was during this vacuum of authority that the region saw the rise of the Signoria and the Comune. In the anarchic conditions that often prevailed in medieval Italian city-states, people looked to strong men to restore order and disarm the feuding elites. In times of anarchy or crisis, cities sometimes offered the Signoria to individuals perceived as strong enough to save the state, most notably the Della Scala family in Verona, the Visconti in Milan and the Medici in Florence.
Italy during this period became notable for its merchant Republics. These city-states, oligarchical in reality, had a dominant merchant class which under relative freedom nurtured academic and artistic advancement. The four classic Maritime Republics in Italy were Venice, Genoa, Pisa and Amalfi.
Venice and Genoa were Europe's gateways to trade with the East, with the former producer of the renowned venetian glass. Florence was the capital of silk, wool, banks and jewelry. The Maritime Republics were heavily involved in the Crusades, taking advantage of the new political and trading opportunities, most evidently in the conquest of Zara and Constantinople funded by Venice.
During the late Middle Ages Italy was divided into smaller city-states and territories: the kingdom of Naples controlled the south, the Republic of Florence and the Papal States the centre, the Genoese and the Milanese the north and west, and the Venetians the east. Fifteenth-century Italy was one of the most urbanised areas in Europe and the birthplace of Renaissance. Florence in particular, with the writings of Dante Alighieri (1265–1321), Francesco Petrarch (1304–1374) and Giovanni Boccaccio (c. 1313–1375), as well as the painting of Giotto di Bondone (1267–1337), is considered the centre of this cultural movement. Scholars like Niccolò de' Niccoli and Poggio Bracciolini scoured the libraries in search of works of classical authors, such as Plato, Aristotle, Euclid, Ptolemy, Cicero and Vitruvius.
The Black Death pandemic in 1348 left its mark on Italy by killing one third of the population.[14] The recovery from the disaster led to a resurgence of cities, trade and economy which greatly stimulated the successive phases of Humanism and the Renaissance. In 1494 the French king Charles VIII opened the first of a series of invasions, lasting up to sixteenth century, in a competition between France and Spain for the possession of the country. Ultimately Spain prevailed through the Treaty of Cateau-Cambresis which recognised Spanish dominance over the Duchy of Milan and the Kingdom of Naples. The holy alliance between Habsburg Spain and the Holy See resulted in the systematic persecution of any Protestant movement. Austria succeeded Spain as hegemon in Italy under the Peace of Utrecht. Through Austrian domination, the northern part of Italy gained economic dynamism and intellectual fervor. The French Revolution and the Napoleonic Wars (1796–1815) introduced the ideas of equality, democracy, law and nation. Italy’s population between 1700 and 1800 rose by about one-third, to 18 million