Constantine I, 1868–1923, king of the Hellenes, eldest son of George I , whom he succeeded in 1913. Married to Sophia, sister of the German emperor William II , he opposed the pro-Allied policy of the Greek premier, Eleutherios Venizelos , and was forced to abdicate in 1917 under Allied military pressure. His second son, Alexander , succeeded to the throne. Recalled (1920) on Alexander's death, he continued the war against Turkey, although the Allies withdrew their support from Greece. The Turkish victory at Izmir caused a military rebellion, and Constantine in 1922 was again deposed and exiled. His eldest son, George II , succeeded. Constantine is also known as Constantine XII.
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