Did you know that the King of Spades on a playing card was originally supposedly designed to represent King David from the Bible? The sword he holds was supposed to be the sword used to cut off Goliath's head after young David killed him with a rock from his his sling.
During the early parts of the Civil War - Robert E Lee was given the nickname "King of Spades" because of his propensity to dig trenches as part of his strategy. At first the nickname was derisive because soldiers hate to dig. Later when the effectiveness of his tactics saved the lives of many of these same soldiers - the nickname became affectionate. Reportedly Lee always loathed the nickname.
And he didn't play cards.