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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