Carlsburg was a 17th century fortified town in Swedish Bremen-Verden

Bremen-Verden

Bremen-Verden, formally the Duchies of Bremen and Verden , were two territories and immediate fiefs of the Holy Roman Empire, which emerged and gained Imperial immediacy in 1180...

 at the confluence of the Weser and Geeste

Geeste (river)

The Geeste is a river in northwestern Germany, running through Lower Saxony and Bremen. It is the most downstream tributary of the River Weser and joins it near Bremerhaven...

 rivers, at the site of modern Bremerhaven

Bremerhaven

Bremerhaven is a city at the seaport of the free city-state of Bremen, a state of the Federal Republic of Germany. It forms an enclave in the state of Lower Saxony and is located at the mouth of the River Weser on its eastern bank, opposite the town of Nordenham...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

. Planned to compete with Bremen

Bremen

The City Municipality of Bremen is a Hanseatic city in northwestern Germany. A commercial and industrial city with a major port on the river Weser, Bremen is part of the Bremen-Oldenburg metropolitan area . Bremen is the second most populous city in North Germany and tenth in Germany.Bremen is...

, the settlement did not prosper.

After the Thirty Years' War

Thirty Years' War

The Thirty Years' War was fought primarily in what is now Germany, and at various points involved most countries in Europe. It was one of the most destructive conflicts in European history....

, the Swedish Empire

Swedish Empire

The Swedish Empire refers to the Kingdom of Sweden between 1561 and 1721 . During this time, Sweden was one of the great European powers. In Swedish, the period is called Stormaktstiden, literally meaning "the Great Power Era"...

 gained the Lower Saxon

Lower Saxony

Lower Saxony is a German state situated in north-western Germany and is second in area and fourth in population among the sixteen states of Germany...

 Prince-Archbishopric of Bremen as a Swedish dominion

Dominions of Sweden

The Dominions of Sweden or Svenska besittningar were territories that historically came under control of the Swedish Crown, but never became fully integrated with Sweden. This generally meant that they were ruled by Governors-General under the Swedish monarch, but within certain limits retained...

. The status of the city of Bremen however was uncertain, and Sweden was unable to gain control of the town in two subsequent wars, 1654 and 1666

Swedish Wars on Bremen

The Swedish Wars on Bremen were fought between the Swedish Empire and the Hanseatic town of Bremen in 1654 and 1666. Bremen claimed to be subject to the Holy Roman Emperor, maintaining Imperial immediacy, while Sweden claimed Bremen to be a mediatised part of her dominions of Bremen-Verden,...

. As Bremen itself was out of reach, a new town was built nearby, named Carlsburg after the Swedish king Charles XI

Charles XI of Sweden

Charles XI also Carl, was King of Sweden from 1660 until his death, in a period in Swedish history known as the Swedish empire ....

.

The town was planned by Stockholm

Stockholm

Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...

 architect Nicodemus Tessin the Elder

Nicodemus Tessin the Elder

Nicodemus Tessin the Elder was an important Swedish architect.-Biography:Nicodemus Tessin was born in Stralsund in Pomerania and came to Sweden as a young man. There he met and worked with the architect Simon de la Vallée...

. Tessin planned the public buildings and streets. He designated 300 to 456 building grounds for houses. Constructions began on 11 June 1672.

In 1675/76, during the Scanian War

Scanian War

The Scanian War was a part of the Northern Wars involving the union of Denmark-Norway, Brandenburg and Sweden. It was fought mainly on Scanian soil, in the former Danish provinces along the border with Sweden and in Northern Germany...

, the newly created navy of Brandenburg-Prussia

Brandenburg-Prussia

Brandenburg-Prussia is the historiographic denomination for the Early Modern realm of the Brandenburgian Hohenzollerns between 1618 and 1701. Based in the Electorate of Brandenburg, the main branch of the Hohenzollern intermarried with the branch ruling the Duchy of Prussia, and secured succession...

 launched its first attack on a landside fortification on Carlsburg. The attack however was not successful.

Sweden lost the site in the course of the Great Northern War

Great Northern War

The Great Northern War was a conflict in which a coalition led by the Tsardom of Russia successfully contested the supremacy of the Swedish Empire in northern Central Europe and Eastern Europe. The initial leaders of the anti-Swedish alliance were Peter I the Great of Russia, Frederick IV of...

in 1712. When Bremerhaven was founded in 1827, some of the old Carlsburg walls were levelled.

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