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Paddy Roy Bates proclaimed HM Fort Roughs, a former World War II Maunsell Sea Fort in the North Sea off the coast of Suffolk, England, as an independent sovereign state: the Principality of Sealand (pictured).

Related Wikipedia articles
Paddy Roy Bates
Founder of the Principality of Sealand (1921–2012)
Patrick Roy Bates, self-styled as Prince Roy of Sealand, was a British pirate radio broadcaster and micronationalist, who founded the self-proclaimed Principality of Sealand.Source: Wikipedia (CC BY-SA)
HM Fort Roughs
Naval fort off the coasts of Suffolk and Essex, United Kingdom
HM Fort Roughs is one of several World War II installations that were designed by Guy Maunsell and known collectively as His Majesty's Forts or as Maunsell Sea Forts; the purpose of which was to guard the port of Harwich, Essex, and more broadly, the Thames estuary. This 4,500…Source: Wikipedia (CC BY-SA)
Maunsell Forts
Series of historic fortified towers on the coast of England
The Maunsell Forts are towers built in the Thames and Mersey estuaries during the Second World War to help defend the United Kingdom. They were operated as army and navy forts, and named for their designer, Guy Maunsell. The forts were decommissioned during the late 1950s and…Source: Wikipedia (CC BY-SA)
Suffolk
County of England
Suffolk is a ceremonial county in the East of England, with some of it being part of the East Anglia section. It is bordered by Norfolk to the north, the North Sea to the east, Essex to the south, and Cambridgeshire to the west. Ipswich is the largest settlement and the county…Source: Wikipedia (CC BY-SA)
Principality of Sealand
Unrecognised micronation in the North Sea
The Principality of Sealand is an unrecognized micronation on HM Fort Roughs, an offshore platform in the North Sea. It is situated on Rough Sands, a sandbar located approximately 11 kilometres (6 nmi) from the coast of Suffolk and 13 kilometres (7 nmi) from the coast of Essex.…Source: Wikipedia (CC BY-SA)