The settlement was originally known as
Pulino. It was founded in the 12th century by the Polini family and subsequently passed under the control of the Arroni family. In 1248,
Pope Innocent IV granted the town to
Spoleto. During the 14th century, it experienced shifting allegiances and occupations: in 1333 it was taken by the forces of King
Robert of Anjou of Naples, and in 1340 it renewed its submission to Spoleto. Throughout the Middle Ages, it functioned as a fortified border center between the
Kingdom of Naples and the
Papal States. A local mint operated there, striking coinage with gold extracted from a nearby mine. In 1416 the fortress was acquired by Niccolò VIII,
Bartolomeo IV, and Corrado XV
Trinci. The following year the lordship passed to Tommaso and Giampaolo di Chiodo, and in 1421 the Rocca was assigned to Corrado XV Trinci. Later in the 15th century, control returned to the Polini family. The early 16th century was marked by further unrest. In 1527, during a popular uprising, the nobleman Andrea de' Domo was killed after being accused of sexually assaulting a young girl, and the inhabitants rose in revolt and again submitted to Spoleto. In 1528 the town was occupied by and allied
Landsknechts. Later in the century it came under the rule of the of Terni. Through the marriage of Maria Clelia Castelli and Alessandro Baldassini, authority passed into the Baldassini line; Francesco Maria Baldassini Castelli eventually died without direct heirs, bringing that branch to an end. In 1762 an iron and silver mine was opened in the surrounding mountains. During the 1760s, the local mint produced early
scudi of
Pope Clement XIII. In the late 18th century, the family of
Arezzo settled in the town. During the period of the French Republic, the town was incorporated into the Canton of Terni. After the Restoration, it became a
baronial municipality under Filippo Stefanoni Simonetti and Antonio Albergotti. In 1860 the town was annexed to the Kingdom of Italy. A
plebiscite held on 4 November 1860 confirmed annexation, and the first municipal elections took place on 11 November of the same year. Francesco Fiorelli was appointed as mayor. == Geography ==