Cesar - King of Diamonds

Starting in the 15th century, French manufacturers assigned to each of the court cards names taken from history or mythology. This practice survives only in the Paris pattern which ousted all its rivals, including the Rouen pattern around 1780. The names for the kings in the Paris pattern are:
David - King of Spades;
Charles - King of Hearts;
Cesar - King of Diamonds;
Alexandre - King of Clubs;