Final answer:
The legendary dynasty mentioned is the Shang dynasty, which existed from 1766 BCE to 1046 BCE in China. Much of the knowledge about the Shang dynasty has been passed down through oral tradition and myths, with archeological evidence and written records supporting its existence and cultural achievements.
Step-by-step explanation:
The legendary dynasty mentioned in the question is the Shang dynasty. Much of what is known about the Shang dynasty has been passed down through oral tradition and myths. The Shang dynasty was one of the first ancient civilizations in China and existed from 1766 BCE to 1046 BCE. Archeological evidence and written records, such as oracle bones, have provided insights into the culture and achievements of the Shang dynasty.