San Lorenzo (366 m.s.l.m.) is a fraction of the municipality of Vittorio Veneto. It rises in a hilly area southwest of Serravalle, enclosed to the north by the Pedof and Baldo mountains and to the south by the Piai and Altare mountains. Its church has very ancient origins. In the past it represented a chaplaincy dependent on the Cathedral of Ceneda; in 1605 it was erected as a parish, although the priest could not reside there. The church could have a tabernacle and a baptistery only from 1733.
It is known that in ancient times the building, in which the relics of the saints Modesta and Liberata were kept, had a niche for the choir and apse and was surrounded by a small cemetery; the façade was surmounted by an elevation that held a bell. There is news of a rebuilding in 1637, but the current building was rebuilt between 1864 and 1898 on the initiative of the parish priest Don Giovanni Mattana and financed, among others, by the Empress Maria Anna of Austria. Damaged during the Great War, it underwent other recovery interventions, the last in the two-year period 1953-1954.
The parish of San Lorenzo, called "in Montagna" to distinguish it from others of the same name, is the smallest in the diocese of Vittorio Veneto in terms of population.