Prince Arthur was a heir to the throne but he had to prove that he was worthy by taking out a mystical sword stuck in a stone in order to become king. He successfully pulled out Excalibur from the stone and thus proved himself.
Your question is incomplete, but i would try my best to give you a general overview that would help you get the correct answer.
The story of Theseus is similar to that of Arthur because he also had to lift a rock and bring the sandals and sword that was kept there by his father King Aegeus. Theseus was able to perform the task when he was of age and brought it to Athens.
Some similarities between Arthur and Theseus:
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