The Principality of Seborga is a micronation located in the north-western Italian region of Liguria, near the French border and about 35 km from Monaco. The principality claims Seborga, an area of 15 km², which is an Italian municipality. It came into being in 954, when the Count of Ventimiglia ceded Seborga to the monks of Lerino, at the foundation of the Cistercian monastery there.

On 20 January 1729, this independent principality was sold to the Kingdom of Piedmont-Sardinia, then ruled by Victor Amadeus II. Subsequently, in 1815, the Congress of Vienna overlooked Seborga in its redistribution of European territories and there is no mention of it in the Act of Unification of Kingdom of Italy in 1861.

The argument for Seborga's present-day status as an independent state is based on the claim that the 1729 sale was never registered by its new owner, the House of Savoy, resulting in the principality falling into a kind of legal twilight zone.

In the early 1960s, Giorgio Carbone a local from Serborga, began promoting the idea that the town retained its historic independence as a principality. By 1963 he was elected as "Head of State" and assumed the name and title of Giorgio I, Prince of Seborga. He died on 25 November 2009. On 25 April 2010 Marcello Menegatto was crowned as His Serene Highness Prince Marcello I and re-elected in 2017. On 12th of April 2019 he announced his intention to abdicate, even if the abdication has not taken place yet.

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