The place where the prince lives. The Book of Changes, one of the Three Changes of the Book of Changes (another view: the Book of Changes is three changes, not the Book of Changes), is one of the traditional classics. It is said that it was written by Zhou Wenwang Jichang, and its contents include the Book of Changes and the Book of Changes. The East Palace in Zhouyi is the place where the prince lives. The East Palace is a reference to the ancient palace in China, so it is named because of its location. Later, it refers to Chu Jun who lives in the East Palace.