Does anyone know the origin of Emperor Wudi's King Wangzhuang?

(1) the source of Bi Gong after the Eastern Zhou Dynasty. Zhou Wuwang's younger brother Bi Gong was made an official in the State of Qin. In the Spring and Autumn Period, Bi Wan, his descendant, was appointed as Situ in the State of Jin, and was given the title of State in the State of Wei. During the Warring States Period, Wei, Han and Zhao carved up the State of Jin. After the Qin Dynasty destroyed Wei, Wei Beizi, his grandson, fled to Mount Tai in Shandong. At the beginning of the Han Dynasty, Wei Beizi became an official and was sealed in Lanling County. Because after Wang, it was called "Wang", and since then it has been named Wang.

2. The source of the surname. At the end of Shang Dynasty, Zhou Wang was dissolute. Bigan repeatedly asked Yan Qiang to protest and was killed. Because Bigan was originally a prince, his descendants took Wang as their surname. From the pre-Qin Dynasty to the Han and Tang Dynasties, Wang, the son of Wang, lived in Henan, forming a famous Wang family in Jixian County, and later spread to Gansu, Shandong, Hebei, Shanxi and other places.