The Wikipedia article of the day for June 11, 2017 is Alexander of Greece.
Alexander (1893–1920) was King of Greece from 11 June 1917 until his death at the age of 27. He succeeded his father, King Constantine I, in 1917, after the Entente Powers of World War I and followers of Eleftherios Venizelos pushed the king and his eldest son Crown Prince George into exile. Venizelos, as prime minister, became the effective ruler with the support of the Entente. Though reduced to the status of a puppet king, Alexander supported Greek troops during their war against the Ottoman Empire and Bulgaria. Under his reign, Greece expanded, following the victory of the Entente and the early stages of the Greco-Turkish War of 1919–1922. Alexander married the commoner Aspasia Manos in 1919, provoking a major scandal that forced the couple to leave Greece for several months. Soon after returning to Greece with his wife, Alexander was bitten by a domestic Barbary macaque and died of septicemia. The sudden death of the sovereign contributed to the fall of the Venizelist regime. After a general election and a referendum, Constantine I was restored.