Prince Axel of Denmark was a cousin of the King of Greece, who ruled during what years?
Constantine I of Greece: Constantine I (Greek: Κωνσταντῖνος Α΄ , "Konstantínos I"; 2 August [O.S. 21 July] 1868 – 11 January 1923) was King of Greece from 1913 to 1917 and from 1920 to 1922.
i don't know