It was one of the corner towers of the city walls, which from its ancient medieval name "Dojòn" (similar to the French "donjon" or the English "dungeon") had given its name to the entire northeastern fortified complex, once the seat of the bishop-count, and to the noble city family of the Doglioni, which was entrusted with its defense.
It belongs to the last generation of fortifications built still in stone before the advent of bricks, which are much more elastic and resistant in the face of the new threat posed by artillery.
Started in 1481 by the Venetian rector Perazzo Malipiero, it was completed in 1489 by Luca Foscarini, whose coat of arms is alongside the lion of St. Mark.
