Stämmer bra det, Anarco.
Wikipedia:
"Popular legend holds that the composition of a deck of cards has religious, metaphysical, or astronomical significance: typical numerological elements of the explanation are that the four suits represent the four seasons, the 13 cards per suit are the 13 phases of the lunar cycle, black and red are for day and night, the 52 cards of the deck (joker excluded) symbolizes the number of weeks in a year, and finally, if the value of each card is added up—and 1 is added, which is generally explained away as being for a single joker—the result is 365, the number of days in a year. If the other joker is also added, that makes 366 days, the amount of days in a leap year. The context for these stories is sometimes given to suggest that the interpretation is a joke, generally being the purported explanation given by someone caught with a deck of cards in order to suggest that their intended purpose was not gambling."
Även på Wikipedia:
King of Spades - David
King of Hearts - Charles (possibly Charlemagne, or Charles VII, where Rachel would then be the pseudonym of his mistress, Agnès Sorel)
King of Diamonds - Julius Caesar
King of Clubs - Alexander the Great
Queen of Spades - Pallas
Queen of Hearts - Judith
Queen of Diamonds - Rachel (either biblical, historical (see Charles above), or mythical as a corruption of the Celtic Ragnel, relating to Lancelot below)
Queen of Clubs - Argine (possibly an anagram of regina, which is Latin for queen, or perhaps Argea, wife of Polybus and mother of Argus)
Knave of Spades - Ogier the Dane/Holger Danske (a knight of Charlemagne)
Knave of Hearts - La Hire (comrade-in-arms to Joan of Arc, and member of Charles VII's court)
Knave of Diamonds - Hector
Knave of Clubs - Judas Maccabeus, or Lancelot
Notera även att hjärter kung saknar mustasch.
Uttrycket "One-eyed royals" existerar också (wikipedia):
"The phrase one-eyed royals is poker jargon referring to the Jack of Spades, Jack of Hearts and King of Diamonds. The terminology results from the depiction of the royal on the card being in profile, resulting in only one eye being visible."