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Gustaf V was born in Drottningholm Palace in Ekero, Stockholm County, the son of Prince Oscar and Princess Sofia of Nassau. At birth Gustaf was created Duke of Varmland. Upon his father's accession to the throne in 1872, Gustaf became crown prince of both Sweden and Norway. On 8 December 1907, he succeeded his father on the Swedish throne, which had been separated from the Norwegian throne two years earlier.

According to Prime Minister Per Albin Hansson during the Midsummer crisis, the King in a private conversation had threatened to abdicate if the Government did not approve a German request to transfer a fighting infantry division - the so-called Engelbrecht Division - through Swedish territory from southern Norway to northern Finland in June 1941, around Midsummer. The accuracy of this claim is debated, and the King's intention (if he did in fact make this threat) is sometimes alleged to be his desire to avoid conflict with Germany. This event has later received considerable attention from Swedish historians and is known as midsommarkrisen, the Midsummer Crisis.  Confirmation of the King's action is contained in German Foreign Policy documents captured at the end of the war. On 25 June 1941, the German Minister in Stockholm sent a "Most Urgent-Top Secret" message to Berlin in which he stated that the King had just informed him that the transit of German troops would be allowed. He added:  The King's words conveyed the joyful emotion he felt. He had lived through anxious days and had gone far in giving his personal support to the matter. He added confidentially that he had found it necessary to go so far as to mention his abdication.  According to Ernst Wigforss, both Gustaf V and Prince Gustav Adolf attempted to persuade the Swedish Government to allow the Allies to transport troops through Sweden, though this was rejected by the Government because it was felt it would cause retributions from Germany.

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Gustaf V of Sweden