Historic southern access to the city, from the ancient river port of Borgo Piave. In the early 1800s, a large part of the city walls was demolished, along with the great tower on the left and the other lateral fortifications that defended the gate. From the original complex, through which the first Venetian rector, Antonio Moro, entered in 1404, and Emperor Maximilian of Habsburg in 1509, the late 13th-century pointed inner arch remains, still containing the niche where chronicles tell that the frescoed coat of arms of the Visconti, lords of Belluno from 1383 to 1404, remained until the 17th century.
The arrangement of the facade (made of brick and not stone, which is unusual for Belluno) follows the project commissioned in 1622 by the Venetian rector Federico Corner to architect Lorenzo d'Alchini. The central niche between the two coats of arms still contains the base with the paws of the lion of St. Mark, which was destroyed by the revolutionary Jacobins in May 1797. The last restoration took place in 1902.
