Bologna

Etruscan, Celtic and Roman times
The area around Bologna has been inhabited since the 9th century BC, as evidenced by the archeological digs in the 19th century in nearby Villanova (Castenaso). This period, and up to the 6th century, is referred to as the Villanovan culture, and had various nuclei of people spread out around this area. In the 7th and 6th centuries BC, Etruria began to have an influence on this area, and the population went from Umbrian to Etruscan. The town was renamed Felsina.

In the 3rd century BC, the city and the surrounding area were conquered by the Boii, a Celtic tribe from Transalpine Gaul. The tribe settled down and mixed so well with the Etruscans, after a brief period of aggression, that they created a civilization that modern historians call Gaul-Etruscan (one of the best examples is the archeological complex of Monte Bibele, in the Apennines near Bologna). The Gauls dominated the area until 196 BC, when they were sacked by the Romans. After the Battle of Telamon, in which the forces of the Boii and their allies were badly beaten, the tribe reluctantly accepted the influence of the Roman Republic, but with the outbreak of the Punic Wars the Celts once more went on a war path. They first helped Hannibal's army cross the Alps then they supplied him with a consistent force of infantry that proved itself decisive in several battles. With the downfall of the Carthaginians came the end of the Boii as a free people, the Romans destroyed many settlements and villages (Monte Bibele was one of them) and then founded the colonia of Bononia in c. 189 BC. The settlers included three thousand Latin families led by the consul Lucius Valerius Flaccus. The Celtic population was ultimately absorbed into Roman society but parts of the language have survived in some measure in the Bolognese dialect, which belongs to the Gallo-Italic group of languages and dialects. The building of the Via Aemilia in 187 BC made Bologna an important centre, connected to Arezzo by way of the Via Flaminia minor and to Aquileia through the Via Aemilia Altinate.

In 88 BC, the city became a municipium: it had a rectilinear street plan with six cardi and eight decumani (intersecting streets) which are still discernible today. During the Roman era, its population varied between c. 12,000 to c. 30,000. At its peak, it was the second city of Italy, and one of the most important of all the Empire, with various temples and baths, a theatre, and an arena. Pomponius Mela included Bononia among the five opulentissimae ("richest") cities of Italy. Although fire damaged the city during the reign of Claudius, the Roman Emperor Nero rebuilt it in the 1st century AD. After the fall of the Roman Empire, Bologna fell under the power of Odoacer, Theoderic the Great (493–526), Byzantium and finally the Lombards, who used it mostly as a military centre. In 774, the city fell to Charlemagne, who gave it to Pope Adrian I.

Middle Ages

Depiction of a 14th-century fight between the militias of the Guelf and Ghibelline factions in Bologna, from the Croniche of Giovanni Sercambi of Lucca.
After a long decline, Bologna was reborn in the 5th century under Bishop Petronius. According to legend, St. Petronius built the church of S. Stefano. After the fall of Rome, Bologna was a frontier stronghold of the Exarchate of Ravenna in the Po plain, and was defended by a line of walls which did not enclose most of the ancient ruined Roman city. In 728, the city was captured by the Lombard king Liutprand, becoming part of the Lombard Kingdom. The Germanic conquerors formed a district called "addizione longobarda" near the complex of S. Stefano. Charlemagne stayed in this district in 786.

In the 11th century, under the Holy Roman Empire, Bologna began to aspire to being a free commune, which it was able to do when Matilda of Tuscany died, in 1115, and the following year the city obtained many judicial and economic concessions from Emperor Henry V. Bologna joined the Lombard League against Frederick Barbarossa in 1164 which ended with the Peace of Constance in 1183; after which, the city began to expand rapidly (this is the period in which its famous towers were built) and it became one of the main commercial trade centres thanks to a system of canals that allowed large ships to come and go.

Traditionally said to be founded in 1088, the University of Bologna is widely considered to be the first university. The university originated as an international centre of study of medieval Roman law under major glossators, including Irnerius. It numbered Dante, Boccaccio and Petrarca among its students.

In the 12th century, the expanding city needed a new line of walls, and at the end of the 13th century, Bologna had between 50,000 and 60,000 inhabitants making it the fifth largest city in Europe (after Cordova, Paris, Venice, and Florence) and tied with Milan as the largest textile industry area in Italy. The complex system of canals in Bologna was one of the most advanced waterway systems in Europe, and took its water from the Savena, Aposa and Reno Rivers. The main canals were Canale Navile, Canale di Reno and Canale di Savena. Hydraulic energy derived from the canal system helped run the numerous textile mills and transport goods.

In 1256, Bologna promulgated the "Paradise Law", which abolished feudal serfdom and freed the slaves, using public money. At that time the city centre was full of towers (perhaps 180), built by the leading families, notable public edifices, churches, and abbeys. In the 1270s Bologna's politics was dominated by Luchetto Gattilusio, a Genoese diplomat and man of letters who became the city Governor. Like most Italian cities of that age, Bologna was torn by internal struggles related to the Guelph and Ghibelline factions, which led to the expulsion of the Ghibelline family of the Lambertazzi in 1274.

After this period of great prosperity, Bologna experienced some ups and downs: The city were home to some 50,000 people in the early 1300s. it was crushed in the Battle of Zappolino by Modena in 1325 but then prospered under the rule of Taddeo Pepoli (1337–1347). Then in 1348, during the Black Plague, about 30,000 inhabitants died, and it subsequently fell to the Visconti of Milan, but returned to Papal control under Cardinal Gil de Albornoz in 1360. In the following years, Republican governments like that of 1377, which was responsible for the building of the Basilica di San Petronio and the Loggia dei Mercanti, alternated with Papal or Visconti resurgences, while the city's families engaged in continual internecine fighting.