It has been identified with the
ancient Roman Capitulum, a
Hernican town. Its area was the seat of several
Roman patrician towns. In 1088 it is mentioned as
Castrum Pileum; according to a legend, the name would stem from the Latin
pileum, the helmet of Roman general
Quintus Fabius Maximus Verrucosus. In that period it depended from the bishop of
Anagni and, from the late 12th century, it was first a fief of the De Pileo and then of the De Antiochia families. In 1347 it was captured by
Cola di Rienzo and, from the late 14th century, it was under the
Colonna family, who held it until 1816. In 1656 the town was decimated by plague. Piglio became part of the newly formed
Kingdom of Italy in 1870. During
World War II, it was bombed by Allied planes, which destroyed about 30 percent of the edifices. ==Main sights==