Constantine II
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See the appropriate page for
- Antipope Constantine II, antipope from 767 - 768
- Constantine II (317 - 340), Roman Emperor 337 - 340
- Constantine II of Scotland (874? - 952), King of Scotland 900 - 942 or 943
- Constantine II of Greece (born 6/2/1940), King of Greece March 6, 1964 - December 8, 1974