The earliest inhabitants of the area were the
Umbri, later displaced by the
Etruscans beyond the
Tiber. In the Roman period the settlement functioned as a military outpost, probably centered on a watchtower controlling the northern pass and forming a link between northern and central Italy. In 917 Passignano was granted as a fief by
Berengar I to Marquis Uguccione II . In 1073
John Gualbert, founder of the
Vallombrosan order, died there. During the 12th century it came under the authority of Perugia and suffered frequent devastation in conflicts involving
Arezzo and
Florence. The settlement was sacked and burned by Arezzo in 1334 and later restored in 1396. Subjugation by
Braccio Fortebraccio occurred in 1416. Between 1479 and 1488 it was occupied by Florence before returning to Perugia. Until 1520 it remained under the rule of the
Baglioni family, followed by control of the and families from 1520 to 1643, when it passed to the
Grand Duchy of Tuscany. In 1600 the waters of
Lake Trasimeno caused sizeable destruction. During the French period it served as the seat of a
canton. In 1817 it became the seat of a governor within the
Delegation of Perugia, with jurisdiction over Bastia Corgna, Fratta Corgna,
Isola Maggiore and Monteruffiano, and with
Castel Rigone as a dependency. A reorganization in 1827 reduced it to a lower-level jurisdiction under
Magione, including Bastia Corgna, San Damiano, Monteruffiano, San Donato and San Vito, again with Castel Rigone as a dependency. In the mid-19th century Passignano had a population of 1,904 inhabitants, of whom 645 lived in the town and 1,258 in the countryside. It was first designated as a municipality in 1857. Annexation to the Kingdom of Italy followed in 1860. In 1904 the first navigation company on Lake Trasimeno was established, providing regular connections with lakeside towns and the islands. Between 1916 and 1922 a
seaplane pilot training school operated there; some of its trainees later took part in the 1931 transatlantic flight. The municipality adopted the name Passignano sul Trasimeno in 1918. == Geography ==