Denmark's relations with its southern neighbours, particularly Prussia, have played a decisive role in constitutional developments.
The 1866 Constitution included strict limits on the almost universal male suffrage that had been recognised by the 1849 Constitution.
In 1915, during the First World War (in which Denmark remained neutral), broad agreement was reached on constitutional reform.
Denmark's exemption from the Schengen open borders agreement expires on November 12th.
But instead of opening the borders, governments in several EU countries have called for a rule change to enable extension of the measure for up to four years.
Famed Danish writers include Hans Christian Andersen, whose fairy tales have been translated into more languages than any other book except the Bible; the theologian and philosopher Søren Kierkegaard, a forerunner of modern existentialism; and Karen Blixen, who penned "Out of Africa" and "Babette's Feast".