Table:
text: List of state leaders in 499 BC
List of state leaders in 499 BC
List of state leaders in 499 BC
State_ Type_ Name_ Title Royal_house From_
Yan Sovereign Jian I Duke — 504 BC
Yue Sovereign Yun Chang Marquis — 538 BC
Zheng Sovereign Sheng Duke — 500 BC

Question: What is the name of a state of Yan among the list of heads of state in 499 BC? BC?