... the jack (or "knave")...

"In the English pattern, the jack and the other face cards represent no one in particular. In contrast to the historical French practice, in which each court card is said to represent a particular historical or mythological personage. The valets in the Paris pattern have traditionally been associated with such figures as Ogier the Dane (a knight of Charlemagne and legendary hero of the chansons de geste) for the jack of spades; La Hire (French warrior) for the Jack of Hearts; Hector (mythological hero of the Iliad) for the jack of diamonds; and Lancelot or Judas Maccabeus for the jack of clubs."