Christian X of Denmark

Prince Christian and Princess Alexandrine with their son Frederick in 1900

Christian married Alexandrine of Mecklenburg-Schwerin in Cannes on 26 April 1898; she was a daughter of Frederick Francis III, Grand Duke of Mecklenburg-Schwerin, and Grand Duchess Anastasia Mikhailovna of Russia. She eventually became his queen consort. They had two sons:

• Prince Frederick (1899–1972), later King Frederick IX of Denmark
• Prince Knud (1900–1976), later Knud, Hereditary Prince of Denmark

The couple were given Christian VIII's Palace at Amalienborg Palace in Copenhagen as their residence and Sorgenfri Palace north of Copenhagen as a summer residence. Furthermore, the couple received Marselisborg Palace in Aarhus as a wedding present from the people of Denmark in 1898. In 1914, the King also built the villa Klitgården in Skagen.

On 29 January 1906, King Christian IX died, and Christian's father ascended the throne as King Frederick VIII. Christian himself became crown prince.

Christian X addressing the people when he acceded the throne

On 14 May 1912, King Frederick VIII died after collapsing from shortness of breath while taking a walk in a park in Hamburg, Germany. He had been returning from a recuperation stay in Nice, France, and was staying anonymously in the city before continuing to Copenhagen. Christian was in Copenhagen when he heard about his father's demise and acceded to the throne as Christian X.

King Christian and the German Emperor during a visit to Berlin in 1913

In April 1920, Christian instigated the Easter Crisis, perhaps the most decisive event in the evolution of the Danish monarchy in the twentieth century. The immediate cause was a conflict between the King and the cabinet over the reunification with Denmark of Schleswig, a former Danish fiefdom, which had been lost to Prussia during the Second War of Schleswig. Danish claims to the region persisted to the end of World War I, at which time the defeat of the Germans made it possible to resolve the dispute. According to the terms of the Treaty of Versailles, the disposition of Schleswig was to be determined by two plebiscites: one in Northern Schleswig (Denmark's South Jutland County 1971–2006), the other in Central Schleswig (today part of the German state of Schleswig-Holstein). No plebiscite was planned for Southern Schleswig, as it was dominated by an ethnic German majority and, in accordance with prevailing sentiment of the times, remained part of the post-war German state.

In Northern Schleswig, seventy-five percent voted for reunification with Denmark and twenty-five percent for remaining with Germany. In this vote, the entire region was considered to be an indivisible unit, and the entire region was awarded to Denmark. In Central Schleswig, the situation was reversed with eighty percent voting for Germany and twenty percent for Denmark. In this vote, each municipality decided its own future, and German majorities prevailed everywhere. In light of these results, the government of Prime Minister Carl Theodor Zahle determined that reunification with Northern Schleswig could go forward, while Central Schleswig would remain under German control.

Many Danish nationalists felt that at least the city of Flensburg, in Central Schleswig, should be returned to Denmark regardless of the plebiscite's results, due to the sizeable Danish minority there and a general desire to see Germany permanently weakened in the future. Christian X agreed with these sentiments, and ordered Prime Minister Zahle to include Flensburg in the re-unification process. As Denmark had been operating as a parliamentary democracy since the Cabinet of Deuntzer in 1901, Zahle felt he was under no obligation to comply. He refused the order and resigned several days later after a heated exchange with the King.

Subsequently, Christian X dismissed the rest of the cabinet and replaced it with a de facto conservative caretaker cabinet. The dismissal caused demonstrations and an almost revolutionary atmosphere in Denmark, and for several days the future of the monarchy seemed very much in doubt. In light of this, negotiations were opened between the King and members of the Social Democrats. Faced with the potential overthrow of the Danish crown, Christian X stood down and dismissed his own government, installing a compromise cabinet until elections could be held later that year.

To date, this is the last time a sitting Danish monarch has attempted to take political action without the full support of parliament. Following the crisis, Christian X bowed fully to his drastically reduced status, and spent the last quarter-century of his rule as a model constitutional monarch.

During the German occupation of Denmark, the King's daily ride through Copenhagen became a symbol of Danish sovereignty. This picture was taken on his birthday in 1940

On 9 April 1940 at 4 pm the 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.[5] 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,[6] in exchange for retaining political independence in domestic matters,[7] 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 Greece, 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 Belgium) 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.)

Two versions of the King's Emblem Pin (Kongemærket), showing Christian's CX cypher; a popular symbol of patriotism during the war

Until the imposition of martial law by Germany in August 1943, Christian's official speeches reflected the government's official policy of cooperation with the occupying forces, but this did not prevent his being seen by the Danish people as a man of "mental resistance." During the first two years of the German occupation, in spite of his age and the precarious situation, he nonetheless took a daily ride on his horse, Jubilee, through Copenhagen, unaccompanied by a groom, let alone by a guard. A popular way for Danes to display patriotism and silent resistance to the German occupation was wearing a small square button with the Danish flag and the crowned insignia of the king.[8] This symbol was called the Kongemærket (King's Emblem pin). In addition, he helped finance the transport of Danish Jews to unoccupied Sweden, where they would be safe from Nazi persecution.[9]

In 1942, Adolf Hitler sent the king a long telegram congratulating him on his seventy-second birthday. The king's reply telegram was a mere, Spreche Meinen besten Dank aus. Chr. Rex (Giving my best thanks, King Christian). This perceived slight, known as the Telegram Crisis, greatly outraged Hitler and he immediately recalled his ambassador from Copenhagen and expelled the Danish ambassador from Germany. German pressure then resulted in the dismissal of the government led by Vilhelm Buhl and its replacement with a new cabinet led by non-party member and veteran diplomat Erik Scavenius, whom the Germans expected to be more cooperative. (In any event, whatever independence Denmark had been able to maintain during the first years of the occupation ended abruptly with the German Putsch in August 1943.) After a fall with his horse on 19 October 1942, he was more or less an invalid for the rest of his reign.[10] The role he played in creating the Easter Crisis of 1920 greatly reduced his popularity, but his daily rides, the Telegram Crisis, and the admiring stories spread by Danish-American circles had once again made him popular to the point of being a beloved national symbol.

The accession of a new Danish–Icelandic Act of Union in late 1918 redefined Iceland, a longtime part of the Danish realm, as a sovereign state in a personal union with the King of Denmark. This made Christian the king of the mostly autonomous Kingdom of Iceland in addition to being King of Denmark. Christian (whose name in Iceland was officially Kristján X) was the first and only monarch to ever reign over Iceland as a sovereign kingdom as opposed to ruling it as a province of a larger kingdom. In 1941, after the German occupation of Denmark and the Allied occupation of Iceland, the Icelandic government concluded that Christian was unable to perform his duties as head of state of Iceland, and thus appointed Sveinn Björnsson as regent to act as provisional head of state. Sveinn had previously been Iceland's ambassador in Copenhagen.

In 1944, while Denmark was still under German occupation, Icelanders voted in a plebiscite to sever all ties with the King of Denmark and to found a republic. Thus, Christian's title as King of Iceland became null and void and Sveinn Björnsson was elected the first President of Iceland by the Icelandic parliament. Christian, who believed that Sveinn had given him assurances that Iceland would not make further moves toward independence while the occupation was ongoing, felt quite badly betrayed. However, at the urging of his relative, the King of Sweden, Christian still accepted the outcome and sent a message of congratulations to Iceland during the celebration of the founding of the Republic on 17 June 1944. The reading of the King's letter provoked cheers at Þingvellir during the celebration. Despite this implicit acceptance of Iceland's independence, Christian never actually stopped using the title "King of Iceland", and continued including it in his regnal name until his death in 1947.

On his death in Amalienborg Palace, Copenhagen, in 1947, Christian X was interred along other members of the Danish royal family in Roskilde Cathedral near Copenhagen. Although he had been behind the politics of Erik Scavenius, a cloth armband of the type worn by members of the Danish resistance movement was placed on his coffin at castrum doloris.[11][12]