The Four Kings in a Deck of Cards are real kings from the past

• King of Spades: David, King of Israel from the Old Testament
• King of Clubs: Alexander the Great, King of Macedonia, who conquered a vast region and lived from 356 to 323 BCE.
• King of Hearts: Charlemagne, King of France and the first Holy Roman Emperor, who lived from 747 to 814 AD.
• King of Diamonds: Roman Caesar Augustus. Some sources say the king of diamonds is Julius Caesar, not Augustus.