Christian X of Denmark sibling Haakon VII of Norway
Christian X (Danish: Christian Carl Frederik Albert Alexander Vilhelm; 26 September 1870 – 20 April 1947) was King of Denmark from 1912 to his death in 1947, and the only King of Iceland as Kristján X, in the form of a personal union rather than a real union between 1918 and 1944.
He was a member of the House of Glücksburg, a branch of the House of Oldenburg, and the first monarch since King Frederick VII born into the Danish royal family; both his father and his grandfather were born as princes of a ducal family from Schleswig. Among his siblings was King Haakon VII of Norway. His son became Frederick IX of Denmark. Among his cousins were King George V of the United Kingdom, Tsar Nicholas II of Russia, and King Constantine I of Greece, while Queen Maud of Norway, was both his cousin and sister-in-law.  
His character has been described as authoritarian and he strongly stressed the importance of royal dignity and power. His reluctance to fully embrace democracy resulted in the Easter Crisis of 1920, in which he dismissed the democratically elected Social Liberal cabinet with which he disagreed, and installed one of his own choosing. This was in accordance with the letter of the constitution, but the principle of parliamentarianism had been considered a constitutional custom since 1901. Faced with mass demonstrations, a general strike organized by the Social Democrats and the risk of the monarchy being overthrown he was forced to accept that a monarch could not keep a government in office against the will of parliament, as well as his reduced role as a symbolic head of state.
During the German occupation of Denmark, Christian became a popular symbol of resistance, particularly because of the symbolic value of the fact that he rode every day through the streets of Copenhagen unaccompanied by guards. With a reign spanning two world wars, and his role as a rallying symbol for Danish national sentiment during the German occupation, he became one of the most popular Danish monarchs of modern times. King Christian X was known to parade through town on his horse, Jubilee.World War I
At the outbreak of the First World War in 1914, King Christian and the Danish government advocated that Denmark pursue a policy of neutrality. The King supported the policy of neutrality by participating in the so-called meeting of the Three Kings held on 18 December 1914 in Malmö in Sweden. There, the three Scandinavian monarchs King Christian X of Denmark, King Haakon VII of Norway (Christian's brother) and King Gustav V of Sweden (Christian's mother's cousin) met along with their foreign ministers to discuss and emphasize the neutrality of the Nordic countries, and in a joint declaration, confirmed the three states' strict neutrality during the war. The meeting in 1914 was followed by another three-kings meeting in Kristiania in November 1917.
Denmark in fact managed to maintain its neutrality during the war. However, the Danish government bowed to pressure from Germany, and had naval mines laid in Danish waters with tacit British acceptance, despite the fact that Denmark was obliged under international law to keep its territorial waters open.
In 1915, the Constitution of Denmark was changed to introduce universal suffrage, and women were given the right to vote along with domestic servants. Although the king was reluctant to the constitutional changes, the Danish Women's Society organized a procession with approximately 20,000 participants who went to Amalienborg to thank the king. In his address to the procession, the king stated, among other things: In one place, women cannot be dispensed with, and that is in the homes. Here, the influence of women cannot be replaced, because through the child's love for the home, the love for our common home, Denmark, is awakened.World War II
On 9 April 1940 at 4 am Nazi Germany invaded Denmark in a surprise attack, overwhelming Denmark's Army and Navy and destroying the Danish Army Air Corps. Christian X quickly realized that Denmark was in an impossible position. Its territory and population were far too small to hold out against Germany for any sustained period of time. Its flat land would have resulted in it being easily overrun by German panzers; Jutland, for instance, would have been overrun in short order by a panzer attack from Schleswig-Holstein immediately to the south. Unlike its Nordic neighbours, Denmark had no mountain ranges from which a drawn-out resistance could be mounted against the German army.  With no prospect of being able to hold out for any length of time, and faced with the explicit threat of the Luftwaffe bombing the civilian population of Copenhagen, and with only one general in favour of continuing to fight, Christian X and the entire Danish government capitulated at about 6 am, in exchange for retaining political independence in domestic matters, beginning the occupation of Denmark, which lasted until 5 May 1945.
In contrast to his brother, King Haakon VII of Norway, and Queen Wilhelmina of the Netherlands, King George II of the Hellenes, Grand Duchess Charlotte of Luxembourg, King Peter II of Yugoslavia, President Edvard Beneš of Czechoslovakia and President Władysław Raczkiewicz of Poland, all of whom went into exile during the Nazi occupation of their countries, Christian X (like King Leopold III of the Belgians) remained in his capital throughout the occupation of Denmark, being to the Danish people a visible symbol of the national cause (Haakon escaped the German advance after refusing to accept a Nazi-friendly puppet regime.)
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