The church of San Leonardo in Treponzio is situated along an important road attested since Roman times.
The church was first mentioned in 1115. The homonymous hospital, founded in 1105, was probably in the courtyard on the north side of the church. The church was rebuilt in Modern times maintaining basically its original Latin cross structure, datable to the beginning of the XII
th century with a single
nave and a semicircular
apse. Different building techniques were employed in the eastern and western parts of the building, a difference that can be ascribed to the work of successive groups of masons during the construction. Nothing remains today of the original bell tower, completely rebuilt in 1894 on the south-eastern corner of the church, possibly in the same place of the ancient one.