The first Prince of Yan was Zang Tu, a national of the former Yan state in the Warring States period who served under Xiang Yu during the rebellion against the Qin dynasty. In 202 BC, Zang swore fealty to Liu Bang, the founder of Han dynasty. Later that year, Zang rebelled against Han, and was captured and executed. Yan was subsequently granted to Lu Wan, a trusted general and early follower of the emperor.Book of Han, Chapter 13.
