Castello di Zuglio

Inhabited since 500 BC, originally a Celtic settlement, it was later Romanised (Julium Carnicum). Due to its strategic location (it lay close to the Roman road connecting the Roman Empire with Austria and Northern Europe, and also controlled Passo di Monte Croce and the Incaroio Valley) it quickly became a municipium (autonomous municipality). As a consequence, its population were admitted to the Tribus Claudia and granted full Roman citizenship - a policy that Rome adopted to assimilate the barbaric population living along its borders. A military settlement at first, it then acquired civilian features such as a forum, baths, temples, and patrician villas.

Possibly attacked by the Quads and Marcomans in 168 BC, it was attacked by the Goths in 401-408, by the Huns in 452 and by the Lombards in 568. Each time it was reconstructed and repopulated and troops were garrisoned there. 

Archaeological excavations have brought to light the Roman forum along with numerous other finds. No Medieval remains have been uncovered so far, but it is believed that during the Middle Ages the town was surrounded by walls.