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George I of Greece (Greek: Γεώργιος Αʹ, Βασιλεύς των Ελλήνων; 24 December 1845 – 18 March 1913) was King of Greece from 1863 until his death in 1913. Originally a Danish prince, George was born in Copenhagen, and seemed destined for a career in the Royal Danish Navy. He was only 17 years old when he was elected king by the Greek National Assembly, which had deposed the unpopular former king Otto. His nomination was both suggested and supported by the Great Powers: the United Kingdom, the Second French Empire, and the Russian Empire. He married the Russian grand duchess Olga Constantinovna of Russia, and became the first monarch of a new Greek dynasty.

George's reign of almost 50 years (the longest in modern Greek history) was characterized by territorial gains as Greece established its place in pre-World War I Europe. Britain ceded the Ionian Islands peacefully, while Thessaly was annexed from the Ottoman Empire after the Russo-Turkish War. During the First Balkan War, after Greek troops had occupied much of Greek Macedonia, George was assassinated in Thessaloniki.