During World War II, the municipality’s territory was involved in the activities of the Friulian Resistance with the participation of the Garibaldi Brigades and the Osoppo Brigades.
It is a dispersed municipality, and the municipal seat is located in the locality of Paludea. First mentioned in 1140 (Chonradus de Castelnovo), the toponym refers to the presence of a fortification built in the 10th century.
In 1976, the municipality was devastated by the Friuli earthquake, causing enormous collapses and damage. Among the religious monuments are the Church of San Nicolò Vescovo in the locality of Vigna, also called the Church of Borc, designed by Girolamo D’Aronco, the Church of San Carlo Borromeo in the locality of Paludea, whose foundation stone was laid in 1934 and the work continued until 1960, and the Chapel of San Daniele di Colle Monaco in the locality of Celante.
