The Fisher King (King Pellehan or Anfortas), the guardian of the Holy Grail, who falls into sin and consequently suffers a wound from a mystical Spear of Destiny. He becomes the Maimed King, and his kingdom suffers similarly, becoming the Wasteland: neither will be healed until the successful completion of the Grail Quest.
The wound is in the genitals - symbolizing the wounding of the noble masculine Kingship

“In the Post-Vulgate Cycle, Thomas Malory's Le Morte d'Arthur, and later works based on them, the stroke is delivered by Sir Balin. He ignores an "unearthly voice" warning him off, strikes the king when he is deprived of his weapon, and thinks that the stroke is justified.”
“In the Post-Vulgate cycle and Thomas Malory's Le Morte d'Arthur, the Fisher King's wound was given to him by Sir Balin in the "Dolorous Stroke", when Balin grabs a spear and stabs Pellam in self-defense. However, the spear is the Spear of Longinus, the lance that pierced Christ's side, and Pellam and his land must suffer for its misuse until the coming of Galahad. The Dolorous Stroke is typically represented as divine vengeance for a sin on the part of its recipient. The nature of Pellam's sin is not stated explicitly, though he at least tolerates his murderous brother Garlon, who slays knights while under cover of invisibility, apparently at random.”
- divine vengeance for a sin on the part of its recipient
“While the details and location of the injury vary, the injury ultimately represents the inability of the Fisher King to produce an heir. Although some iterations have two kings present, one or both are injured, most commonly in the thigh. The wound is sometimes presented as a punishment, usually for philandering. In Parzival, specifically, the king is injured by the bleeding lance as punishment for taking a wife, which was against the code of the "Grail Guardians".[6] In some early storylines Percival asks the Fisher King the healing question, which cures the wound. The nature of the question differs between Perceval and Parzival, but the central theme is that the Fisher King can be healed only if Percival asks "the question””
“The location of the wound is significant to the legend. In most medieval stories, the mention of a wound in the groin or more commonly the "thigh" (such as the wounding of the ineffective suitor in Lanval from the Lais of Marie de France) is a euphemism for the physical loss of or grave injury to one's genitalia. In medieval times, acknowledging the actual type of wound was considered to rob a man of his dignity, thus the use of the substitute terms "groin" or "thigh", although any informed medieval listener or reader would have known exactly the real nature of the wound. Such a wound was considered worse than actual death because it signaled the end of a man's ability to function in his primary purpose: to propagate his line. In the instance of the Fisher King, the wound negates his ability to honor his sacred charge.”