Duchy of Castro

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Duchy of Castro
Ducato di Castro  (Italian)
Ducatus Castri  (Latin)
Vassal of the Papal States
Castrum civitas fidelis
Capital Castro
Languages Latin, Italian
Religion Catholicism
Government Non-sovereign monarchy
 •  1537–1545 Pier Luigi Farnese (first)
 •  1646–1649 Ranuccio II Farnese (last)
Historical era Early modern era
 •  Created by Pope Paul III 1537
 •  Disestablished. Ranuccio II is forced to cede the lands back to Pope Innocent X 1649
Preceded by
Succeeded by
Papal States
Papal States
Today part of  Italy

The Duchy of Castro was a fiefdom in central Italy formed in 1537 from a small strip of land on what is now Lazio's border with Tuscany, centred on Castro, Lazio, a fortified city on a tufa cliff overlooking the Fiora River which was its capital and ducal residence. Technically a vassal state to the Papal States, it in fact enjoyed de facto independence under the rule of the House of Farnese until 1649, when it was subsumed back into the Papal States.

It was created a duchy by Pope Paul III (1534–1549) in the bull Videlicet immeriti on 31 October 1537, with his son Pier Luigi Farnese and his firstborn male heirs as its dukes. It only lasted little more than 110 years and was eclipsed by the Farnese's possessions in Parma, it stretched from the Tyrrhenian Sea to the Lago di Bolsena, in the strip of land bounded by the river Marta and the river Fiora, stretching back to the Olpeta stream and the lago di Mezzano, from which the Olpeta flows. The duchy of Latera and county of Ronciglione were annexed to it.

Wars of Castro[edit]

List of Dukes of Castro[edit]