As for the ten famous swords in ancient times, it was said that the Tangxi Sword was the first, but the historical records did not find its true origin. The true origin of the Tangxi Sword was the Treasure Sword Chapter in the Book of Han·Yiwen Zhi: In the Han Dynasty, there was a Tangxi sword. It was very clever. It had no ring and no buckle. It could cut through heaven and earth. The "Tangxi Sword" in the [Treasure Sword Chapter] did not refer to the Tangxi Sword itself, but to a sword called the Tangxi Sword. However, the Tangxi sword was not mentioned in the historical records, probably because it was not classified as one of the ten famous swords. The Records of the Historian was a historical work written by Sima Qian of the Western Han Dynasty. It had an in-depth study of ancient Chinese culture, history, politics, and other aspects. However, some of the content might be incomplete or lost due to the long time or other reasons. Therefore, the specific content of the ten famous swords in ancient times might need more literature to supplement and improve.