Nina Menegatto

The claim of sovereignty for Seborga was put forward in 1963 by a Seborgan former flower grower named Giorgio Carbone. He claimed to have found documents from the Vatican archives which, according to Carbone, indicated that Seborga had never been a possession of the House of Savoy and was therefore not legitimately included in the Kingdom of Italy when it was formed in 1861 during Italian unification. Carbone claimed that Seborga had existed as a sovereign state of Italy since 954, and that from 1079 it was a principality of the Holy Roman Empire. Sovereignty claims assert that Seborga was overlooked by the Congress of Vienna in its redistribution of European territories after the Napoleonic Wars.

Carbone promoted the idea of Seborgan independence as a principality, and in 1963 the town's inhabitants elected him as their putative head of state. Carbone assumed the style and title His Tremendousness (Sua Tremendità) Giorgio I, Prince of Seborga. He formed a "cabinet" of ministers; minted a local currency, the luigino; introduced a Seborgan flag, a white cross on a blue background; and established a Latin motto, Sub Umbra Sede (Sit in the shade). Carbone's campaign has generally not been taken seriously and is widely viewed as a ruse to attract tourists to the town, although his supporters in the town claim that their small state has been recognised by Burkina Faso.

In January 2006, Carbone announced that he would abdicate on reaching the age of 70, apparently as a result of a row over rebuilding the village centre, but he didn't and continued to hold the office until his death. Even so, this decision was the subject of a feature on the BBC World Service radio programme World Today on 25 January 2006.

Giorgio Carbone retained his ceremonial position until his death on 25 November 2009 (age 73), due to complications due to amyotrophic lateral sclerosis. The position of the Serborgan "monarch" is not hereditary, and since Carbone's death, elections have been held in Seborga every seven years among the town's 200 registered voters. Carbone was succeeded by businessman Marcello Menegatto, who was elected on 25 April 2010 and crowned on 22 May 2010 as His Serene Highness (Sua Altezza Serenissima or SAS) Prince Marcello I. Menegatto was re-elected as Prince on 23 April 2017, after an unsuccessful challenge to the position by Mark Dezzani, a British-born radio DJ who had lived in Seborga for nearly 40 years.

On 12 April 2019, Menegatto abdicated from his position, and he was succeeded by his ex-wife, Nina Menegatto, who was elected by the town as Her Serene Highness Princess Nina on 10 November 2019.

Seborga's independence claims continue today, and an official Principato di Seborga website asserts the historical arguments put forward by Carbone. Seborga claims to maintain a volunteer border guard, the Corpo delle Guardie. Participants wear a blue-and-white uniform and during the tourist season they stand guard at sentry boxes on the unofficial border crossing on the main road into Seborga.

The unrecognised micronation that claims Seborga Town understands that the town still falls directly within the laws and borders of Italy.

Seborga's local currency, the Seborga luigino, is divided into 100 cents. Luigini coins circulate in Seborga alongside the euro. The currency has no value outside of the town. The value of the luigino is pegged to the US dollar at SPL 1 = USD 6.00. On 20 August 2023 the Principality presented the first banknote ever of the luigini.

As of 1 January 2018, Seborga had a population of 297 people, with 146 males and 151 females. As of 2021, the population of Seborga has gone down to 217 people.