Guelphs and Ghibellines in the context of "Roman Catholic Diocese of Bergamo"

The Italian Renaissance (Italian: Rinascimento [rinaʃʃiˈmento]) was a period in Italian history during the 15th and 16th centuries. The period and place are known for the initial development of the broader Renaissance culture that spread from Italy to the rest of Europe (and also to extra-European territories ruled by colonial powers or where Christian missionaries and/or traders were active). The period was one of transition: it sits between the Middle Ages and the modern era. Proponents of a "long Renaissance" argue that it started around the year 1300 and lasted until about 1600. In some fields, a Proto-Renaissance, beginning around 1250, is typically accepted. The French word renaissance (corresponding to rinascimento in Italian) means 'rebirth', and defines the period as one of cultural revival and renewed interest in classical antiquity after the centuries during what Renaissance humanists labelled as the "Dark Ages". The Italian Renaissance historian Giorgio Vasari used the term rinascita ('rebirth') in his Lives of the Most Excellent Painters, Sculptors, and Architects in 1550, but the concept became widespread only in the 19th century, after the work of scholars such as Jules Michelet and Jacob Burckhardt.

The Renaissance began in Tuscany in Central Italy and centered in the city of Florence. The Florentine Republic, one of the several city-states of the peninsula, rose to economic and political prominence by providing credit to European monarchs and by laying the groundwork for developments in capitalism and banking. Renaissance culture later spread to Venice, the heart of a Mediterranean empire controlling trade routes with the east since its participation in the Crusades and following the journeys of Marco Polo between 1271 and 1295. Thus Italy renewed contact with the remains of ancient Greek culture, which provided humanist scholars with new texts. Finally the Renaissance had a significant effect on the Papal States and on Rome, largely rebuilt by humanist and Renaissance popes, such as Julius II and Leo X, who frequently became involved in Italian politics, in arbitrating disputes between competing colonial powers and in opposing the Protestant Reformation, which started c. 1517.

Ottone Visconti (1207 – 8 August 1295) was Archbishop of Milan and Lord of Milan, the first of the Visconti line. Under his rule, the commune of Milan became a strong Ghibelline city and one of the Holy Roman Empire's seats in Italy.

The House of Della Torre (Torriani or Thurn) was an Italian noble family who dominated Lombardy and much of northern Italy between the 12th and 14th centuries. They owned the Lordship of Milan before being expelled by the Visconti at the Battle of Desio. They were members of the Guelphs.

According to the linealogy of the family, the house would descend from the imperial family of Charlemagne.

Francesco Grimaldi (French: François; English: Francis), called il Malizia (from Italian: "the malicious") was the Genoese leader of the Guelphs who captured the Rock of Monaco on the night of 8 January 1297. He was the son of Guglielmo Grimaldi by his wife Giacobina or Giacoba, a Genoese noble.

Luchetto Gattilusio (fl. 1248–1307) was a Genoese statesman, diplomat, and man of letters. As a Guelph he played an important role in wider Lombard politics and as a troubadour in the Occitan language he composed three poems descriptive of his times.

Conrad III (German: Konrad; Italian: Corrado; 1093 or 1094 – 15 February 1152) of the Hohenstaufen dynasty was from 1116 to 1120 Duke of Franconia, from 1127 to 1135 anti-king of his predecessor Lothair III, and from 1138 until his death in 1152 King of the Romans in the Holy Roman Empire. He was the son of Duke Frederick I of Swabia and Agnes, a daughter of Emperor Henry IV.

His reign saw the start of the conflicts between the Guelphs and Ghibellines. He was involved in the failed Second Crusade with Louis VII, where he would fight and lose at Doryleum and would later fall ill and return to Constantinople. After recuperating, he went to Jerusalem but would experience a string of failed sieges. Later returning from the Crusade, he was entangled in some conflicts with Welf VI's claim to the Duchy of Bavaria. On his deathbed, he designated his nephew Frederick Barbarossa as his successor instead of his son, Frederick IV, Duke of Swabia.

Dominium mundi is the idea of universal dominion developed in the Middle Ages. Inspired by the memory of the Roman Empire, dominium mundi implied the recognition of one supreme authority, which generated a prolonged political and spiritual struggle between imperial and ecclesiastical power. This struggle can be said to have begun with the Investiture Controversy, and was mainly embodied by the Holy Roman Empire and Catholic Church, which elevated the emperor and the Pope, respectively, to the status of supreme ruler.

The idea of universal dominion divided Italy into the warring faction of Guelphs and Ghibellines. Guelphs supported the Church, while the Ghibellines supported the Empire. After two hundred years of division during the 12th and 13th centuries, neither one of the powers had prevailed, due to their mutual dependency and the rise of the powerful and practically independent reigns of Church and the State. The idea of dominium mundi did not reappear in its original form, despite the fact that both universal powers subsisted.