Constantine II (Κωνσταντῖνος Βʹ, Βασιλεὺς τῶν Ἑλλήνων, Konstantínos Βʹ, Vasiléfs ton Ellínon; 2 June 1940 – 10 January 2023) was the last King of Greece, reigning from 6 March 1964 until the abolition of the Greek monarchy on 1 June 1973.