Introduction to the Ancient City of Lu State in Qufu: Because the Zhougong Temple is located at the site of the Ancient City of Lu State, there is also a stone tablet with the words "Qufu Ancient City of Lu State" erected in front of the temple gate. The ancient city of Lu was the capital of Lu in the Zhou Dynasty and the longest-lasting capital among the vassal states of the Zhou Dynasty. There are rich cultural relics and historic sites preserved in the ruins of the ancient city, which are of great significance to the study of Shandong culture and the development of Shandong commerce.