King Constantine I of Greece was born on August 2, 1868 in Athens, Greece. Constantine’s birth was met with great joy in Greece as he would be the first Greek-born child of a modern Greek monarch. He was the eldest of the eight children of King George I of the Hellenes and his wife Grand Duchess Olga Konstantinovna of Russia, daughter of Grand Duke Constantine Nikolaievich who was a son of Tsar Nicholas I of Russia. Constantine’s father was born Prince Vilhelm (William) of Schleswig-Holstein-Sonderburg-Glücksburg and later became a Prince of Denmark when his father succeeded to the Danish throne as King Christian IX. When he was only 17 years old, Prince Vilhelm was elected King by the Greek National Assembly.
Constantine had four brothers and three sisters:
- George (1869–1957), married Princess Marie Bonaparte, had issue
- Alexandra (1870–1891), married Grand Duke Paul Alexandrovich of Russia; had issue including Grand Duke Dmitri Pavlovich of Russia who was involved in the murder of Rasputin, Alexandra died giving birth to Dmitri
- Nicholas (1872–1938), married Grand Duchess Elena Vladimirovna of Russia, had issue including Princess Marina, Duchess of Kent
- Marie (1876–1940), married (1) Grand Duke George Mikhailovich of Russia, had issue; married (2) Admiral Perikles Ioannidis, no issue
- Olga (1880), died at seven months
- Andrew (1882–1944), married Princess Alice of Battenberg, had issue including Prince Philip, Duke of Edinburgh
- Christopher (1888–1940), married (1) Nancy Stewart Worthington Leeds, no issue; married (2) Princess Françoise of Orléans, had issue
Although Danish born King George I retained his Lutheran faith, all his children were baptized Greek Orthodox and learned Greek from birth. Constantine was tutored by prominent university professors in Greek literature, mathematics, physics, and history. In 1882, Constantine enrolled in the Hellenic Military Academy, the officer cadet school of the Hellenic Army. After graduation, Constantine received further military education in the German Imperial Army in Berlin. He also attended the University of Heidelberg and the University of Leipzig in Germany where he studied political science and business. In 1890, he returned to Greece and embarked on a military career. With the rank of Major General, Constantine took over the command of the 3rd Army in Athens.
During the summer of 1887, many European royals were in England to celebrate Queen Victoria’s Golden Jubilee. Queen Victoria observed a relationship developing between her granddaughter Princess Sophie of Prussia and Constantine, and was pleased. Constantine was not very bright, but as Queen Victoria wrote to her eldest child Victoria, Princess Royal, Sophie’s mother, “a good heart and a good character…go far beyond cleverness.” The couple became engaged shortly after the death of Sophie’s father, Friedrich III, German Emperor in 1888. Despite having the approval of Queen Victoria and her eldest brother Wilhelm, now the German Emperor, Sophie did not have the wholehearted agreement of her mother. Her mother dreaded sending Sophie so far away, and she thought the stability of the Greek throne was uncertain and the country was considered underdeveloped. Nevertheless, Sophie and Constantine married on October 27, 1889 in Athens, Greece. They had a Greek Orthodox service at the Metropolitan Cathedral of the Annunciation and then a Lutheran service in the private Lutheran chapel of King George I of Greece. A contemporary account of the wedding can be read at Otago Witness: The Royal Wedding in Athens.
Sophie and Constantine had six children and there is a 23 year age gap between their eldest and youngest child.
- King George II of the Hellenes (1890 – 1947), married Princess Elisabeta of Romania
- King Alexander of the Hellenes (1893 – 1920), married Aspasia Manos
- Princess Helen of Greece, Queen Mother of Romania (1896 – 1982), married King Carol II of Romania
- King Paul I of the Hellenes (1901 – 1964), married Princess Frederica of Hanover
- Princess Irene of Greece, Duchess of Aosta (1904 – 1974), married Prince Aimone, Duke of Aosta
- Princess Katherine of Greece, The Lady Katherine Brandram (1913 – 2007), married Major Richard Brandram
On March 18, 1913, Constantine’s father King George I was assassinated and he acceded to the Greek throne as King Constantine I.
At first, Constantine was a popular king because of his success in the war against Turkey and Bulgaria. At the outbreak of World War I in August 1914, Greece remained a neutral nation. However, Greece had signed a treaty with Serbia in 1913 obliging Greece to come to Serbia’s aid if attacked by Bulgaria. Bulgaria did attack Serbia, disagreements arose between King Constantine and the Greek Prime Minister, the King was accused of pro-German sentiments, and he was forced to abdicate in 1917. Constantine and his family went into exile in Switzerland.
Crown Prince George, was also suspected of collaborating with the Germans, so it was the second son Alexander, who succeeded his father on the throne. In 1920, Alexander died of blood poisoning as a result of a monkey bite, and the third son Paul, was asked to take over the throne. After Paul declined, Constantine was brought back after a change of government and a referendum allowing his return from exile. Constantine was enthusiastically welcomed by the Greek people, but the enthusiasm did not last long. After a defeat in a war against Turkey in 1922, Constantine was forced to abdicate a second time and again go into exile. The crown went to his eldest son George, who reigned until 1925 when he was forced to abdicate. He was restored to the throne in 1936 and reigned until his death in 1947, when his younger brother Paul became king. Thus, all three sons of Constantine became Kings of Greece.
On January 11, 1923, Constantine died at the age of 54 from a brain hemorrhage in Palermo, Sicily. He was buried in the crypt of the Russian Church of Florence in Italy. With the restoration of the monarchy in 1936, the returning of the remains of Greek royals to Greece was permitted. The Greek government sent the battleship Averof Brindisi to pick up the remains of Constantine, his mother Queen Olga, and his wife Queen Sophia, who had also died in exile. The battleship arrived in Piraeus, Greece on November 17, 1936. An official procession transported the remains to the Metropolitan Cathedral of the Annunciation in Athens where they lay in state for six days. The remains were then buried at the Royal Cemetery at Tatoi Palace.