Inside the room, with a rectangular layout and perpendicular to the aisles of the Cathedral, it has a wooden ceiling and various frescoes by Francesco da Milano, Pozzoserrato and other local artists, which describe episodes ranging from the creation of the World to the Last Judgment. There are no certain documents that attest to the year of construction of the Castle of Collalto: even if the traces of the presence of man in the area found by archaeologists date back to prehistoric times, the construction of a first fortified center (including the mighty watchtower) on the hill overlooking the Piave river dates back to the early 12th century, followed by the first document certifying the presence of an administrative entity in 1138. The fortress was given a military function, which gave it the reputation of impregnability, which then, starting from the sixteenth century, became a religious function: the castle was the seat of a Franciscan monastery, later suppressed during the Napoleonic domination and used as a spinning mill.
Artists such as Pordenone and Francesco da Milano worked in the churches and castles of Collalto, and the landscape of Collalto also appears in the works of the famous Cima da Conegliano. The village and the fortress were almost completely destroyed during the Great War, leaving only the keep and the tower which was later used as a bell tower.
