King Arthur is a legendary figure who was said to have lived a long, long time ago in a place called Camelot. He was supposed to be a really great king who had lots of brave knights who fought for good and helped people who needed it.
Some stories say that when King Arthur was just a baby, he was taken away from his parents and raised by another family. When he grew up, he found out that he was really a prince and he was supposed to become king. So, he went on lots of quests and battles to prove himself and help people.
King Arthur also had a really special sword called Excalibur that was said to be magical. The sword was so powerful that nobody could beat him in a fight while he had it.
One of the most famous stories about King Arthur is about a round table he had where all of his knights would sit. Arthur believed that everyone who sat at the table was equal and that they should all work together to make the world a better place.
There are lots of different stories about King Arthur, and some people believe that he was a real person while others think he may have just been a legend. But no matter what, people still tell his stories and remember the things he did to help others.