Gluckstadt, Mississippi, an unincorporated community in the U.S. state of Mississippi
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Glückstadt, a town in the Steinburg district of Schleswig-Holstein, Germany
Glückstadt was founded in 1617 on the marsh lands along the Elbe by the Duke of Holstein, King Christian IV of Denmark, who had levees and fortifications built as well as a ducal residence.
The great ransom paid by Sweden (called the Älvsborg Ransom) was used by Christian IV, amongst many other things, to found the cities of Glückstadt, Christiania (refounded after a fire), Christianshavn, Christianstad and Christianssand.
The same year, Aitzema was sent to Denmark to persuade the King to abolish the new toll he raised in Glückstadt, which weighed especially on the Hamburgers; but this mission also was without success.
The seat of the duke was Sonderburg, but parts of the domain were located in Denmark (in the Duchy of Schleswig), mainly on the islands of Als and Ærø and around Glücksburg, whilst other lands were part of the Holy Roman Empire (in the Duchy of Holstein), including the Ämter of Plön, Ahrensbök, and Reinfeld.