King Constantine I

Constantine I was King of Greece from 1913 to 1917 and from 1920 to 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 captured Thessaloniki, and doubled in area and population. He succeeded to the throne of Greece on 18 March 1913, following his father's assassination.
His disagreement with Eleftherios Venizelos over whether Greece should enter World War I led to the National Schism. Constantine forced Venizelos to resign twice, but in 1917 he abdicated, after threats of the Entente forces to bombard Athens; he left the Crown to his second son, Alexander. After Alexander's death, Venizelos' defeat in the 1920 legislative elections, and a plebiscite in favor of his return, Constantine reassumed his duties as King. Constantine abdicated the throne for the second and last time in 1922, when Greece lost the Greco-Turkish War of 1920-1922. He was succeeded by his eldest son, George II.