What was the official position of Wei Guogong in the Tang Dynasty?

-From Yipin. Titles in the Tang Dynasty are divided into nine grades: Wang, the heir to the county king, Wang, Guo Gong, Guo Gong, Guo Hou,, and Guo Gong. Titles are linked to commodities, with "Wang" as one product, county kings and lord protector as two products, founding chiefs as two products and founding chiefs as two products.