Constantine I
Constantine in 1921
King of the Hellenes
First reign	18 March 1913 – 11 June 1917
Predecessor	George I
Successor	Alexander
Prime Ministers

Constantine I (Greek: Κωνσταντίνος Αʹ, Konstantínos I; 2 August [O.S. 21 July] 1868 – 11 January 1923) was King of Greece from 18 March 1913 to 11 June 1917 and from 19 December 1920 to 27 September 1922. He was commander-in-chief of the Hellenic Army during the unsuccessful Greco-Turkish War of 1897 and led the Greek forces during the successful Balkan Wars of 1912–1913, in which Greece expanded to include Thessaloniki, doubling in area and population. He succeeded to the throne of Greece on 18 March 1913, following his father's assassination.

Constantine’s disagreement with Eleftherios Venizelos over whether Greece should enter World War I led to the National Schism. He forced Venizelos to resign twice, but in 1917 he left Greece, after threats by the Entente forces to bombard Athens; his second son, Alexander, became king. After Alexander's death, Venizelos' defeat in the 1920 legislative elections, and a plebiscite in favor of his return, Constantine was reinstated. He abdicated the throne for the second and last time in 1922, when Greece lost the Greco-Turkish War of 1919–1922, and was succeeded by his eldest son, George II. He died in exile four months later, in Sicily.

Sophia of Prussia

Sophia in 1913
Queen consort of the Hellenes
Tenure	18 March 1913 – 11 June 1917 19 December 1920 – 27 September 1922
Born	14 June 1870 New Palace, Potsdam, Kingdom of Prussia
Died	13 January 1932 (aged 61) Frankfurt, Hesse-Nassau, Free State of Prussia, Weimar Republic
Burial	16 January 1932 Greek Orthodox Church, Florence, Italy 22 November 1936 Royal Cemetery, Tatoi Palace, Greece
Spouse	Constantine I of Greece ​ ​ (m. 1889; died 1923)​
Issue	George II of Greece Alexander of Greece Helen, Queen Mother of Romania Paul of Greece Irene, Queen of Croatia Princess Katherine, Lady Bradham
Names Sophie Dorothea Ulrike Alice
House	Hohenzollern
Father	Frederick III, German Emperor
Mother	Victoria, Princess Royal
Religion	Greek Orthodoxy prev. Calvinism

Sophia of Prussia (Sophie Dorothea Ulrike Alice, Greek: Σοφία; 14 June 1870 – 13 January 1932) was Queen consort of the Hellenes during 1913–1917 and 1920–1922.

A member of the House of Hohenzollern and child of Frederick III, German Emperor, Sophia received a liberal and anglophile education, under the supervision of her mother Victoria, Princess Royal. In 1889, less than a year after the death of her father, she married her third cousin Constantine, heir apparent to the Greek throne. After a difficult period of adaptation in her new country, Sophia gave birth to six children and became involved in the assistance to the poor, following in the footsteps of her mother-in-law, Queen Olga. However, it was during the wars which Greece faced during the end of the 19th and the beginning of the 20th century that Sophia showed the most social activity: she founded field hospitals, oversaw the training of Greek nurses, and healed wounded soldiers.

However, Sophia was hardly rewarded for her actions, even after her grandmother Queen Victoria decorated her with the Royal Red Cross after the Thirty Days' War: the Greeks criticized her links with Germany. Her brother Emperor William II was indeed an ally of the Ottoman Empire and openly opposed the construction of the Megali Idea, which could establish a Greek state that would encompass all ethnic Greek-inhabited areas. During World War I, the blood ties between Sophia and the German Emperor also aroused the suspicion of the Triple Entente, which criticized Constantine I for his neutrality in the conflict.

After imposing a blockade of Greece and supporting the rebel government of Eleftherios Venizelos, causing the National Schism, France and its allies deposed Constantine I in June 1917. Sophia and her family then went into exile in Switzerland, while the second son of the royal couple replaced his father on the throne under the name of Alexander I. At the same time, Greece entered the war alongside the Triple Entente, which allowed it to grow considerably.

After the outbreak of the Greco-Turkish War in 1919 and the untimely death of Alexander I the following year, the Venizelists abandoned power, allowing the royal family's return to Athens. The defeat of the Greek army against the Turkish troops of Mustafa Kemal, however, forced Constantine I to abdicate in favor of his eldest son George II in 1922. Sophia and her family then were forced to a new exile, and settled in Italy, where Constantine died one year later (1923). With the proclamation of the Republic in Athens (1924), she spent her last years alongside her family and died of cancer in Germany in 1932.