About George II of Greece
George II (Greek: Γεώργιος Β', romanized: Geórgios II; 19 July [O.S. 7 July] 1890 – 1 April 1947) was King of Greece from 27 September 1922 until 25 March 1924, and again from 25 November 1935 until his death on 1 April 1947. The eldest son of King Constantine I of Greece and Princess Sophia of Prussia, George followed his father into exile in 1917 following the National Schism, while his younger brother Alexander was installed as king. Constantine was restored to the throne in 1920 after Alexander's death, but was forced to abdicate two years later in the aftermath of the Greco-Turkish War. George acceded to the Greek throne, but after a failed royalist coup in October 1923 he was exiled to Romania. Greece was proclaimed a republic in March 1924 and George was formally deposed and stripped of Greek nationality. He remained in exile until the Greek monarchy was restored in 1935, following a rigged referendum, upon which he resumed his royal duties. The king supported Ioannis Metaxas's 1936 self-coup, which established an authoritarian, nationalist and anti-communist dictatorship known as 4th of August Regime. Greece was overrun following a German invasion in April 1941, forcing George into his third exile. He left for Crete and then Egypt before settling in London, where he headed the Greek government-in-exile. At the end of the war, George returned to Greece after a 1946 referendum had preserved the monarchy. He died of arteriosclerosis in April 1947 at the age of 56. Having no children, he was succeeded by his younger brother, Paul. He was also a male-line first cousin of Prince Philip, Duke of Edinburgh. When the First Balkan War commenced in October 1912, George returned to Greece to fight against the Ottoman Empire. To avoid controversy, their exile was branded as a three-year "education leave", which was approved and so George continued his military training, but with the prestigious First Foot Guards Regiment of the Prussian army. Crown Prince Constantine, whose popularity had grown due to Greece's successes in the First Balkan War, acceded to the throne as King Constantine I. As Greece became more politically stable as violent protests lessened, George, his siblings and his parents returned to Greece at the end of 1910.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.