For those interested, the designation of royal cards to historical figures is attributed to the French, although the cards were used in decks long before representations were doled out.
Paris court card names
King of Spades - David
King of Hearts - Charles (possibly Charlemagne, or Charles VII)
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, 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 of Troy
Knave of Clubs - Could be Judas Maccabeus or Lancelot
Again, this isn't fact, but just how some decided to represent the cards. Interesting, though.
Pj