Depends on your point of veiw - could be Lancelot and Genivere or Mordred.
king arthur
Sir Kay is King Arthur's foster father's son and King Arthur's knight.
the story of King Arthur was a legend. The story is not associated with a specific century.
The story about King Arthur is called Excalibur. In the story King Arthur himself is the one who managed to pull the sword out of the stone. The name of the sword is Excalibur.
The king is the antagonist in the story The Lady or the Tiger because he throw the young male into the area. But this depends if you're looking in the point of view that the young man is the protagonist.
The story of King Arthur is a legend or folk tale, and has been written about in many historical novels, films and TV programmes.
Myth,legend
King Arthur's dreams relate to the telling of the story. What happens in his dreams relate to how the story is told. He makes his decisions based on his dreams.
After Sir Mordred killed King Arthur a man by the name of Constantine took his place. This is not a true story though. King Arthur was not really a king so no one could have taken his place.
There is no mention of a precious stone in the story of King Arthur. However, the famous sword Excalibur is often referred to as the Sword in the Stone.
King Arthur's mentor was the wizard, Merlin. He gave a lot of advice to King Arthur during the time he was with him. An example (from some tellings of the story) is that he gave the legendary Round Table to King Arthur, and advised him to use it.
In the story of Shakuntala, the antagonist is Durvasa, a powerful and hot-tempered sage. He curses Shakuntala, causing King Dushyanta to forget about her until divine intervention resolves the situation.