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ConstantineII (Greek Κωνσταντίνος Β', born June 2, 1940), was the last King of Greece from March 6, 1964 to June 1, 1973.
Constantine Karamanlis who had just won a resounding victory (54% of the vote in a general election) had formally declared his neutrality in the referendum, although he was rumoured to be against the monarchy.
ConstantineII and Queen Anne-Marie live in exile in London, England, where the exiled monarch is a close friend of The Prince of Wales and a godfather to Prince William of Wales.
ConstantineII (Causantín mac Áeda) (874?–952) was king of Scotland from 900 to 942 or 943.
Constantine was involved in two battles with Ragnall (referred to as the Battles of Corbridge) in that area in 914 and 918, both of which resulted in Scottish victories and ultimately a cessation of hostilities there with the Norse.
Constantine was defeated at the Battle of Brunanburh by King Athelstan of England in 937.