In ancient times, Duke Zhou talked about the title of the Zhou Dynasty, and the winner assisted King Zhou to govern the world. The first generation of Duke Zhou in history was named Ji Mingdan (about 1 100 BC), also known as Shu Dan, and was the fourth son of Ji Chang, the king of Zhou Wen. Because the fief was in Zhou (now Qishan North, Shaanxi Province), it was called Duke of Zhou or. He was an outstanding politician, strategist and thinker in the early years of the Western Zhou Dynasty. He is regarded as the founder of Confucianism and one of the most revered ancient saints in Confucius' life. There are many sayings of Duke Zhou in history. More famous is the Duke of Zhou mentioned in the Book of Changes.
Students are saying that you are sleeping and dreaming, because Duke Zhou will inevitably be directly associated with dreams, which are usually called "Duke Zhou's dreams" or "dreaming of Duke Zhou".