Bergamo occupies the site of the ancient town of Bergomum, founded as a settlement of the Celtic tribe of Cenomani. In 49 BC it became a Roman municipality, containing circa 10,000 inhabitants at its peak. An important hub on the military road between Friuli and Raetia, it was destroyed by Attila in the 5th century.
From the 6th century Bergamo was the seat of one of the most important Lombard duchies of northern Italy, together with Brescia, Trento and Cividale del Friuli: its first Lombard duke was Wallaris. After the conquest of the Lombard Kingdom by Charlemagne, it became the seat of a county under one Auteramus (died 816). From the 11th century onwards Bergamo was an independent commune, taking part in the Lombard League which defeated Frederick I Barbarossa in 1165. Caught in the bitter fights between Guelphs and Ghibellines, led in the city by the Colleoni and the Suardi respectively, from 1264 Bergamo was intermittently under the rule of Milan. In 1331 it gave itself to John of Bohemia, but later the Visconti of Milan reconquered it. After a short conquest by the Malatesta in 1407, in 1428 it fell under the control of the Venetian Republic, remaining part of it until 1797. Notably, the Venetians fortified the higher portion of the town. Source: Wikipedia
“Bergamo is listed by UNESCO World Heritage”