Te king of the Britains, King Uther Pendragon, died. His son, Arthur, along with his wife and his citizens mourned for the death of their king.
The Knights of the Round Table, the best knights in the kingdom, did not know who would replace King Uther as king of the Britains.
Merlin, a sorcerer, prophet, and adviser to the king, told the knights and Arthur about the Lady of the Lake. He told them that if a knight were to find the Lady of the Lake, she would give them the Excalibur, the legendary sword with magical powers, which would make that knight the king of the Britains.
Arthur left to search for the Lady of the Lake to take his fathers place as king.
Arthur finds the Lady of the Lake who then gives him the Excalibur.
Arthur returns home with the Excalibur and is renamed, King Arthur.