Ischia di Castro is a comune

Comune

In Italy, the comune is the basic administrative division, and may be properly approximated in casual speech by the English word township or municipality.-Importance and function:...

(municipality) in the Province of Viterbo

Province of Viterbo

The Province of Viterbo is a province in the Lazio region of Italy. Its capital is the city of Viterbo. It is bordered to the north by the Province of Grosseto and Siena, by the north-east with the Province of Terni and Rieti, in the west by the Tyrrhenian Sea and south by the Province of Rome.It...

 in the Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 region Latium

Latium

Lazio is one of the 20 administrative regions of Italy, situated in the central peninsular section of the country. With about 5.7 million residents and a GDP of more than 170 billion euros, Lazio is the third most populated and the second richest region of Italy...

, located about 90 km northwest of Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

 and about 30 km northwest of Viterbo

Viterbo

See also Viterbo, Texas and Viterbo UniversityViterbo is an ancient city and comune in the Lazio region of central Italy, the capital of the province of Viterbo. It is approximately 80 driving / 80 walking kilometers north of GRA on the Via Cassia, and it is surrounded by the Monti Cimini and...

.

Ischia di Castro borders the following municipalities: Canino

Canino

Canino is a town and comune of Italy, in the province of Viterbo in the internal part of Maremma Laziale. It is 15 km W of Valentano and 44 km NW of Viterbo....

, Cellere

Cellere

Cellere is a comune in the Province of Viterbo in the Italian region Latium, located about 90 km northwest of Rome and about 30 km northwest of Viterbo....

, Farnese, Manciano

Manciano

Manciano may refer to several places in Italy:*Manciano, a comune in the Province of Grosseto, Tuscany*Manciano, Umbria, a frazione of Trevi in the Province of Perugia, Umbria* Manciano, a locality of Morlupo in the Province of Rome, Lazio...

, Pitigliano

Pitigliano

Pitigliano is an Italian town and comune of province of Grosseto in the Maremma area of Tuscany. The town stands on an abrupt tuff butte high above the Olpeta, the Fiora and the Lente rivers.-History:...

, Valentano

Valentano

thumb|250px|View of Valentano.Valentano is a town and comune of the province of Viterbo, in the Lazio region of central Italy. It is 33 km from the provincial capital, Viterbo.left|thumb|220px|Rocca Farnese in Valentano....

.

It takes its name from the nearby Castro, a town destroyed by Papal forces

Papal States

The Papal State, State of the Church, or Pontifical States were among the major historical states of Italy from roughly the 6th century until the Italian peninsula was unified in 1861 by the Kingdom of Piedmont-Sardinia .The Papal States comprised territories under...

 in the 17th century. The town is home to the Ducal Palace, or Rocca, to whose project collaborated Antonio da Sangallo the Younger

Antonio da Sangallo the Younger

thumb|250px|The church of Santa Maria di Loreto near the [[Trajan's Market]] in [[Rome]], considered Sangallo's masterwork.thumb|250px|View of St. Patrick's Well in [[Orvieto]]....

 (also designer's of Castro's walls before its destruction). It was once a palace of the Farnese family.