Profession: King of Greece
Why Famous: Constantine I came to the throne in 1913 following his father's assassination, then ruled as King of Greece from 1913 to 1917.
He was forced to resign as a result of his disagreement with Prime Minister Eleftherios Venizelos over whether Greece should abstain or enter World War I, leading to what became known as the National Schism between the supporters of these two sides. After resigning, his son Alexander took the throne.
When Alexander died in 1920, at age 27, from a monkey bite—having tried to separate a monkey and dog who were fighting—Constantine returned to Greece and, following the fall of Venizelos from favour, retook the throne.
Then, after Greece lost the Greco-Turkish War of 1919–1922, Constantine abdicated for a final time and died in exile shortly thereafter.
- 1896-04-10 Spyridon Louis of Greece wins inaugural Olympic marathon (2:58:50) in Athens; runs last lap accompanied by Constantine I
- 1915-03-06 Greek King Constantine I fires premier Venizelos
- 1917-06-11 King Alexander assumes the throne of Greece after his father Constantine I abdicates under pressure by allied armies occupying Athens
- 1920-12-19 King Constantine I is restored as King of the Hellenes after the death of his son Alexander I of Greece and a plebiscite.
- 1922-09-27 King Constantine I of Greece abdicates