Hello!
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On a winter day, the barons and the knights found in the courtyard of a church in London a sword stuck in a stone. The one who could have pulled it off would have become the king of England.
Thousands of people came on the New Year's Day. Many of them tried it, but they were insuccessful. Arthur tried it and he succeed to pull out the sword. He had just found out from his father that he was a king's son and that he had been adopted.
This is how Arthur became King of England.