The United States Playing Card Company suggests that in the past, the King of Hearts was Charlemagne, the King of Diamonds was Julius Caesar, the King of Clubs was Alexander the Great, and the King of Spades was the Biblical King David (see King (playing card)).
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Casino blackjack decks may include markings intended for a machine to check the ranks of cards, or shifts in rank location to allow a manual check via inlaid mirror.
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