Italy in the Middle Ages

The Kingdom of the Lombards (blue) at its greatest extent, under King Aistulf (749–756)

The Church (and especially the bishop of Rome, by now styled the pope), had played an important political role since the time of Constantine.[14]

In the politically unstable situation after the fall of the western empire, the Church often became the only stable institution and the only source of learning in western Europe. Even the barbarians had to rely on clerics in order to administer their conquests. Furthermore, the Catholic monastic orders, such as the Benedictines had a major role both in the economic life of the time, and in the preservation of classical culture (although in the east the Greek authors were much better preserved).[15]

After the Lombard invasion, the popes were nominally subject to the eastern emperor, but often received little help from Constantinople, and had to fill the lack of stately power, providing essential services (ex. food for the needy) and protecting Rome from Lombard incursions; in this way, the popes started building an independent state.[16]

At the end of the 8th century the popes definitely aspired to independence, and found a way to achieve it by allying with the Carolingian dynasty of the Franks: the Carolingians needed someone who could give legitimacy to a coup against the powerless Merovingian kings, while the popes needed military protection against the Lombards.[17]

In 751 the Lombards seized Ravenna and the Exarchate of Ravenna was abolished. This ended the Byzantine presence in central Italy (although some coastal cities and some areas in south Italy remained under Byzantine control until the 11th century). Facing a new Lombard offensive, the papacy appealed to the Franks for aid. In 756 Frankish forces defeated the Lombards and gave the Papacy legal authority over all of central Italy, thus creating the Papal States. However, the remainder of Italy stayed under Lombard (such as Benevento and Spoleto) or Byzantine (such as Calabria, Apulia and Sicily) control.[18]

Expansion of the Frankish Empire:
Blue = realm of Pippin III in 758,
Orange = expansion under Charlemagne until 814,
Yellow = marches and dependencies

In 774, upon a Papal invitation, the Franks invaded the Kingdom of Italy and finally annexed the Lombards; as a reward the Frankish king Charlemagne received papal support. Later, on December 25, 800, Charlemagne was also crowned emperor of the Holy Roman Empire by the pope, triggering controversy and disputes over the Roman name. A war between the two empires soon followed; in 812 the Byzantines agreed to recognize the existence of two Roman Empires in return for an assurance that the remaining Byzantine possessions in Italy would be uncontested.[19]

Throughout this period, some coastal regions, and all of southern Italy, remained under Byzantine or Lombard control. The Imperial authority never extended much south of the Italian Peninsula. Southern Italy was divided amongst the two Lombards duchies of Spoleto and Benevento, who accepted Charlemagne's suzerainty only formally (812), and the Byzantine Empire. Coastal cities like Gaeta, Amalfi, Naples on the Tyrrhenian Sea, and Venice on the Adriatic Sea, were enclaves who were becoming increasingly independent from Byzantium. A conquest of Benevento, otherwise, would have meant the total encompassment of the Papal territories, and probably Charlemagne thought it was good for his relationships with the Pope to avoid such a move. The age of Charlemagne was one of stability for Italy, though it was generally dominated by non-Italian interests. The separation with the Eastern world continued to increase. Leo III was the first Pope to date his Bulls from the year of Charlemagne's reign (795) instead of those of Byzantine emperors. This process of isolation from the Eastern Empire and connection with the Western world of France and Germany, which had started three centuries before, was completed at the beginning of the 9th centuries. Sicily, Calabria, Puglia and Venice were the main exceptions to this rule.[20]

After the death of Charlemagne (814) the new empire soon disintegrated under his weak successors. The equilibrium created through the great emperor's charisma fell apart. This crisis was due also to the emergence of external forces, including the Saracen attacks and the rising power of the marine republics. Charlemagne had announced his division of the Empire in 806: the Lombard-Frank reign, together with Bavaria and Alamannia, was to be handed over to his son Pepin of Italy.

After Charlemagne's son Louis the Pious died in 840, the treaty of Verdun in 843 divided the empire. Louis' eldest surviving son Lothair I became Emperor and ruler of the Central Franks. His three sons in turn divided this kingdom between them, and Northern Italy became the Kingdom of Italy under Louis II, Holy Roman Emperor in 839.

The first half of the 9th century saw other troubles for Italy as well. In 827, Muslim Arabs known as Aghlabids invaded and conquered Sicily; their descendants, the Kalbids, ruled the island until 1053. In 846, Muslim Arabs invaded Rome, looted St. Peter's Basilica, and stole all the gold and silver in it. In response, Pope Leo IV started building the Leonine walls of the Vatican City in 847; they were completed in 853. In the late 9th century, the Byzantines and the Franks launched a joint offensive against the Arabs in southern Italy.

With Charlemagne's conquest of 774, the north of Italy was politically separated from the south completely. Though the Byzantines had continued to hold most of Apulia and Calabria and the Lombard duchies of the south had been aloof of Pavian policies for a century, the situation was exacerbated by the loss of a centralising Lombard authority in the north.

Under Arechis II of Benevento and his successors, it was the Beneventan policy to pay homage to the Carolingian emperors but ignore their rulings. As a result, De facto independence was achieved from Frankish as well as Byzantine authority. The Duchy of Benevento reached its territorial peak under Sicard in the 830s. At his time, the Mezzogiorno was suffering the ravages of the Saracens, against whom Sicard warred constantly. He also warred against his Greek neighbours, especially Sorrento, Naples, and Amalfi. It was in a war with Naples that Duke Andrew II first called in Saracen mercenaries.[21]

In 839, Sicard was assassinated and a civil war broke out which illustrated the nature of political power in the south. It was still largely in the hands of the land-owning aristocracy, who had the power to choose a prince. In 839, some chose Radelchis I, the treasurer and assassin, and some chose Siconulf of Salerno, who was installed at Salerno. This civil war continued apace for a decade, during which the gastaldates of Benevento took the opportunity to entrench their independence, especially Capua, which sided with Siconulf. In 849, the Emperor Louis II, in one of his first acts as King of Italy, invaded the peninsula and imposed peace between the Lombard factions. He divided the principality into two: one at Benevento, one at Salerno. Thenceforward, the history of the Lombard south is one of declining, competing powers.[22]

Castle of Itri, probably dating from Docibilis I's reign.

In the Tyrrhenian Greek cities, the violence raging inland, between them and their fellow Greeks on toe and heel, fostered the circumstances of de facto independence. Naples, in particular, had a history of differences with Byzantium and had in the past sought to make herself dependent on other authorities, often papal. In 801, the Byzantine patrician of Sicily succeeded in creating Anthimus duke. However, Anthimus was unable to control the cities under his rule, Gaeta and Amalfi. Subsequent to Anthimus, the patrician tried to appoint his own candidate without imperial approval. The people rebelled and accepted Stephen III in 821. During Stephen's decade of rule, Naples severed all legal ties to Constantinople and even began minting her own coins. In 840, after a brief flirtation with Frankish servitude, to Lothair I, and a Frankish duke, in the person of Duke Contard, the Neapolitan citizenry elected Sergius I their magister militum. Sergius established a dynasty, the Sergi, that was to rule the duchy for the next three hundred years.

In Gaeta, as in Naples, the violent situation inland required new power structures to maintain Byzantine authority. The Gaetans received their first imperial Byzantine hypati around the time of the Beneventan civil war. While the first hypati remained Byzantine loyals, in 866, the sudden appearance of a new dynasty under Docibilis I represented Gaeta's move from Byzantium towards independence. The first elected ruler of Amalfi was a prefect appearing in 839, simultaneous with the death of Sicard and the appearance of a Gaetan hyaptus. However, Naples, Gaeta, Amalfi, the Tyrrhenian cities, and Venice (in North Italy) retained some allegiance to Byzantium until the 11th century-long after becoming de facto independent.[23]

The period following the Beneventan civil war was one of confusion, brought on by the independence movements in the various cities and provinces and by the Saracen onslaught. In Salerno, a palace coup removed Siconulf's successor Sico II in 853 and destabilised that principality until a new dynasty, the Dauferidi, came to power in 861.

Louis II at the capture of Bari, 871, from Houze's Atlas Universel Historique et Geographique (1850)

In 852, the Saracens took Bari and founded an emirate there. Greek power being significantly threatened, as well as Adriatic commerce, the Byzantine emperor requested an alliance from Louis II of Italy. Similarly, the new prince of Benevento, Adelchis, an independent-minded ruler, also sought his aid. Louis came down and retook Bari in 871 after a great siege. Louis then tried to set up greater control over all the south by garrisoning his troops in Beneventan fortresses. The response of Adelchis to this action was to imprison and rob the emperor while he was staying the princely palace at Benevento. A month later, the Saracens had landed with a new invasive force and Adelchis released Louis to lead the armies against it. Adelchis forced Louis to vow never to re-enter Benevento with an army or to take revenge for his detention. Louis went to Rome in 872 and was released from his oath by Pope Adrian II on 28 May. His attempts to punish Adelchis were not very successful. Adelchis vacillated between nominal fealty to the Carolingian and Byzantine emperors, but, in fact, by his alterations to the Edictum Rothari, he acknowledged himself as the legitimate Lombard "king."

The successors of Adelchis were weak and the principality of Benevento declined just as Salernitan power was beginning to make itself felt. Guaifer of Salerno was on friendly terms with the Saracens, a habit which annoyed the popes and often put a ruler at odds with his neighbours. The south Italian lords continually rotating in their allegiances. Guaifer's successor, Guaimar I, made war on the Saracens. Guaifer had originally associated Guaimar with him as co-ruler, a practice which became endemic to the south and was especially evident in Capua.

Kingdom of Italy (Holy Roman Empire), outlined in red, in the 12th and 13th centuries

In 951 King Otto I of Germany had married Adelaide of Burgundy, the widow of late King Lothair II of Italy. Otto assumed the Iron Crown of Lombardy at Pavia despite his rival Margrave Berengar of Ivrea. The thrones of Italy and Germany were united. When in 960 Berengar attacked the Papal States, King Otto, summoned by Pope John XII, conquered the Kingdom of Italy and on 2 February 962 had himself crowned Holy Roman Emperor at Rome reviving the empire of Charlemagne. From that time on, the Kings of Italy were always also Kings of Germany, and Italy thus became a constituent kingdom of the Holy Roman Empire, along with the Kingdom of Germany (regnum Teutonicorum) and – from 1032 – Burgundy. The German king (Rex Romanorum) would be crowned by the Archbishop of Milan with the Iron Crown in Pavia as a prelude to the visit to Rome to be crowned Emperor by the Pope.[24][25]

The Emperor, or his subordinate ruler of the Kingdom of Italy, nominally controlled the Northern Italian communes. In general, the monarch was an absentee, spending most of his time in Germany and leaving the Kingdom of Italy with little central authority. There was also a lack of powerful landed magnates – the only notable one being the Margraviate of Tuscany, which had wide lands in Tuscany, Lombardy, and the Emilia, but which failed due to lack of heirs after the death of Matilda of Canossa in 1115. This left a power vacuum – increasingly filled by the Papacy and by the bishops, as well as by the increasingly wealthy Italian cities, which gradually came to dominate the surrounding countryside. The papacy went through an age of decadence, which ended only in 999 when emperor Otto III selected Silvester II as pope.

The Iron Crown of Lombardy, for centuries a symbol of the Kings of Italy

Upon the death of Emperor Otto III in 1002, one of late Berengar's successors, Margrave Arduin of Ivrea, even succeeded in assuming the Italian crown and in defeating the Imperial forces under Duke Otto I of Carinthia. Not until 1004 could the new German King Henry II of Germany, by the aid of Bishop Leo of Vercelli, move into Italy to have himself crowned rex Italiae. Arduin ranks as the last domestic "King of Italy" before the accession of Victor Emmanuel II in 1861.

Henry's Salian successor Conrad II tried to confirm his dominion against Archbishop Aribert of Milan and other Italian aristocrats (seniores). While besieging Milan in 1037, he issued the Constitutio de feudis in order to secure the support of the vasvassores petty gentry, whose fiefs he declared hereditary. Indeed, Conrad could stable his rule, however, the Imperial supremacy in Italy remained contested.

Under the Macedonian dynasty, Byzantine power experienced a recovery; and the impact of this was felt in southern Italy. During the late 9th century the amount of territory under direct Byzantine rule (which in the early 9th century was limited to the toe and heel of the peninsula) expanded dramatically. The Catepanate of Italy was set up to administer the newly acquired territory. The rest of Southern Italy remained divided among the Lombard kings and the Italian cities. Both sets of principalities were de facto independent, but paid nominal allegiance to Byzantium.

The Byzantine gains in the southern Italian mainland were, however, accompanied by setbacks in Sicily. In 878 the Arabs captured the crucial city of Syracuse, and by 965 the entire island was under Arab rule.[26]

Marco Polo at the court of Kublai Khan (painting by Tranquillo Cremona, 1863).

Between the 12th and 13th centuries, Italy developed a peculiar political pattern, significantly different from feudal Europe north of the Alps. As no dominant powers emerged as they did in other parts of Europe, the oligarchic city-state became the prevalent form of government. Keeping both direct Church control and Imperial power at arm's length, the many independent city states prospered through commerce, based on early capitalist principles ultimately creating the conditions for the artistic and intellectual changes produced by the Renaissance.[27]

Italian towns had appeared to have exited from Feudalism, so that their society was based on merchants and commerce.[28] Even northern cities and states were also notable for their merchant republics, especially the Republic of Venice.[29] Compared to feudal and absolute monarchies, the Italian independent communes and merchant republics enjoyed relative political freedom that boosted scientific and artistic advancement.[30]

Left: Flag of the modern Italian Navy, displaying the coat of arms of Venice, Genoa, Pisa and Amalfi, the most prominent maritime republics.
Right: Trade routes and colonies of the Genoese (red) and Venetian (green) empires.

Thanks to their favorable position between East and West, Italian cities such as Venice became international trading and banking hubs and intellectual crossroads. Milan, Florence and Venice, as well as several other Italian city-states, played a crucial innovative role in financial development, devising the main instruments and practices of banking and the emergence of new forms of social and economic organization.[30]

During the same period, Italy saw the rise of the Maritime Republics: Venice, Genoa, Pisa, Amalfi, Ragusa, Ancona, Gaeta and the little Noli.[31] From the 11th to the 13th centuries these cities built fleets of ships both for their own protection and to support extensive trade networks across the Mediterranean, leading to an essential role in the Crusades. The maritime republics, especially Venice and Genoa, soon became Europe's main gateways to trade with the East, establishing colonies as far as the Black Sea and often controlling most of the trade with the Byzantine Empire and the Islamic Mediterranean world.

The defense of the Carroccio during the battle of Legnano (by Amos Cassioli, 1860).

The papacy regained its authority, and started a long struggle with the empire, about both ecclesiastical and secular matters. The first episode was the Investiture Controversy. In the 12th century those Italian cities which lay in the Holy Roman Empire launched a successful effort to win autonomy from the Holy Roman Empire. In the north, a Lombard League of communes launched a successful effort to win autonomy from the Holy Roman Empire, defeating Emperor Frederick Barbarossa at the Battle of Legnano in 1176. This made north Italy a land of quasi-independent or independent city-states until the 19th century (see Italian city-states and history of every city). The revolts were funded by the Byzantine Empire, which hoped to expel the Germanic peoples from Italy; this sponsorship was, like the invasion of the south, part of a 12th century Byzantine effort to regain the influence it had once held on the peninsula during the reign of Justinian I.

In the 11th century, the Normans occupied the Lombard and Byzantine possessions in Southern Italy, ending the six century old presence of both powers in the peninsula. The independent city-states were also subdued. During the same century, the Normans also ended Muslim rule in Sicily. Norman rule in what had once been Byzantine territory naturally angered Constantinople, which in 1155 made a last attempt under Emperor Manuel I Komnenos to reassert its authority in Southern Italy. However, the attempt failed, and in 1158, the Byzantines left Italy.[32]

Unlike the Norman conquest of England (1066), which took place over the course of a few years after one decisive battle, the conquest of Southern Italy was the product of decades and many battles, few decisive. Many territories were conquered independently, and only later were all unified into one state. Compared to the conquest of England, it was unplanned and unorganised, but just as permanent.

Thanks to the marriage between the Emperor Henry VI and Constance, heiress to the Sicilian throne, the Kingdom of Sicily was in a personal union with the Holy Roman Empire from 1194 to 1254. The Kingdom of Sicily would last under various dynasties until the 19th century.