Here's why:
* Mythological Figure: Emperor Yao is often considered a semi-mythical figure, and his reign is placed in a very ancient period (traditionally around 2357-2255 BCE).
* Lack of Historical Evidence: There's limited archaeological and written evidence from this era, making it difficult to confirm the existence or dates of individuals like Emperor Yao.
* Historical Accounts Vary: Different historical accounts and texts provide varying dates for Yao's reign.
Therefore, there is no definitive answer to when Emperor Yao was born.