Duborg Castle
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Duborg Castle (Danish: Duborg Slot, German: Duburg Schloss) sometimes also referred to as Flensborghus (German: Flensburghaus) was a fortification and castle in Flensburg, Schleswig during the Middle Ages and Early modern period.
There is uncertainty about the etymology of Dyborg.[1] One theory suggest that it was named after a Danish knight called Jens Due, who lived in the 16th century.[1][2] Another explanation is that a dove (Danish: due) may have been included in the castle's coat of arms and thereby given its name.[1] In early history of the castle it was named German Marienburg or Danish Marieborg after the hill it was erected on, which bore the same name.[3][4]