Here the noble family originated which extended its properties over much of the upper Treviso area and dominated the political scene of Treviso in the 1300s.
A first document, a copy of the 1138 will of Count Alberto leaving for the Crusade in the Holy Land, testifies to the existence of a castle with church and village on the Collalto hill. Certainly, since the early 1100s a fortified center was built to guard the pass on the Piave river between Col di Guardia and Montello. Ensedisio I, Count of Treviso, was assigned the county where the noble family, probably of Lombard origin already present in Treviso since the 9th century, settled definitively. The first construction of a solid castle, for exclusive military use on the well-protected Collalto hill, dates back to the first half of the 12th century, with the erection of a mighty guard tower. It is the gigantic keep that still stands alone among the ruins of the fortified town, with that sad and chipped face, testimony to the passage of time and lived history.
The Collaltos stood out for their ingenuity and courage. They dominated the military scene of the upper Treviso March of the 13th century, opposed by the other powerful feudal family: the Da Camino.