"Sword in the Stone" is a popular tale from Arthurian legend that tells the story of how King Arthur became the ruler of Britain. In the story, a magical sword is embedded in a stone, and only the true king can pull it out. Many knights and nobles try and fail, but a young boy named Arthur succeeds, proving his rightful claim to the throne. The tale emphasizes themes of destiny, leadership, and the idea that true nobility comes from character rather than birth. It has been adapted into various forms of media, including books, films, and plays, making it a lasting part of Western literature.