EntityQ320615· pop 6· linked from 4 articlesDuborg CastleSign in to savecastle in Flensburg, SchleswigConnectionsGermanEntityDanishEntityMiddle AgesEntityColumbidaeEntity16th centuryEntityetymology scienceEntitycastleEntitycoat of armsEntityFlensburgEntityfortificationEntityearly modern periodEntityChristian IV of DenmarkEntityMargaret I of DenmarkEntityChristian I of DenmarkEntityFrederick III of DenmarkEntitylist of Danish monarchsEntityEric of PomeraniaEntityChristian V of DenmarkEntityDuchy of SchleswigEntityHolsteinEntityCategoriesBuildings and structures completed in the 15th centuryFlensburgFormer castles in DenmarkFormer castles in GermanyGermany articles missing geocoordinate data